Using Cisco Unified Communications Manager to Configure Transcoding and Media Termination Point

Table Of Contents

Using Cisco Unified Communications Manager to Configure Transcoding and Media Termination Point

Prerequisites for Transcoding and MTP for Cisco VGD 1T3 Voice Gateway

DSP Resources

Codecs

Restrictions for Transcoding and MTP for the Cisco VGD 1T3 Voice Gateway

Information About Transcoding and MTP for the Cisco VGD 1T3 Voice Gateway

DSP Farms

DSP Farm Profiles

Transcoding and MTP

Media Termination Point

Allocation of DSP Resources

Allocation of DSP Resources Within the Voice Network Module

Allocation of DSP Resources Within the DSP Farm

Transcoding Session Capacities

Configuring Transcoding and MTP for the Cisco VGD 1T3 Voice Gateway

Determining DSP Resource Requirements

Enabling SCCP on the Cisco Unified Communications Manager Interface

Configuring Transcoding and MTP

Configuration Examples for Transcoding and MTP

DSP-Farm Services on the Cisco VGD 1T3: Example

Out-Band to In-Band DTMF Relay: Example

Out-Band to In-Band DTMF Relay for MTP Device: Example

SIP Gateway: Example

Using Cisco Unified Communications Manager to Configure Transcoding and Media Termination Point

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This chapter describes the steps for enabling transcoding and media termination point (MTP) support on Cisco VGD 1T3 voice gateways in a Cisco Unified Communications Manager network. This feature provides enhanced multiservice support by enabling transcode functions and MTP in voice gateway routers. Using transcoding services reduces bandwidth needs resulting in tangible cost savings.

Digital signal processor (DSP) farms provide transcoding services using DSP resources on high-density digital voice/fax network modules. This chapter contains the following sections:

•Prerequisites for Transcoding and MTP for Cisco VGD 1T3 Voice Gateway

•Restrictions for Transcoding and MTP for the Cisco VGD 1T3 Voice Gateway

•Information About Transcoding and MTP for the Cisco VGD 1T3 Voice Gateway

•Configuring Transcoding and MTP for the Cisco VGD 1T3 Voice Gateway

•Configuration Examples for Transcoding and MTP

Prerequisites for Transcoding and MTP for Cisco VGD 1T3 Voice Gateway

The prerequisites defined in the sections below apply to the configuration of transcoding and MTP for the Cisco VGD 1T3 Voice Gateway:

•DSP Resources

•Codecs

DSP Resources

The Cisco VGD 1T3 voice gateway uses PVDM2 modules to provide DSP resources for transcoding and hardware MTP services. Use Cisco Unified Communications Manager 5.0 (formerly known as Cisco CallManager 5.0) or later for transcoding and for MTP. You must have Cisco IOS Release 12.4(20)YA or later.

Codecs

End-user devices must be equipped with one of the following codecs:

Codec	Packetization Periods for Transcoding (ms)
G.711 a-law, G.711 mu-law	10, 20, or 30
G.729, G.729A, G.729B, G.729AB	10, 20, 30, 40, 50, or 60

Restrictions for Transcoding and MTP for the Cisco VGD 1T3 Voice Gateway

•DSP farm services communicate with Cisco Unified Communications Manager using Skinny Client Control Protocol (SCCP); other protocols are not supported.

•DSP farm services are not supported for Cisco Survivable Remote Site Telephony (SRST) or Cisco Unified Communications Manager Express.

•Hardware MTPs support only G.711 a-law and G.711 u-law. If you configure a profile as a hardware MTP, and you want to change the codec to other than G.711, you must first remove the hardware MTP by using the no maximum sessions hardware command.

•Only one codec is supported for each MTP profile. To support multiple codecs, you must define a separate MTP profile for each codec.

•If an MTP call is received but MTP is not configured, transcoding is used if resources are available.

•Dynamic conference and transcoding resource allocation is not supported.

•Fax is not supported for transcoding.

Information About Transcoding and MTP for the Cisco VGD 1T3 Voice Gateway

To configure transcoding, you should understand the following concepts:

•DSP Farms

•DSP Farm Profiles

•Transcoding and MTP

•Media Termination Point

•Allocation of DSP Resources

•Transcoding Session Capacities

DSP Farms

A DSP farm is the collection of DSP resources available for transcoding and MTP services. DSP farms are configured on the voice gateway and managed by Cisco Unified Communications Manager through Skinny Client Control Protocol (SCCP).

The DSP farm can support a combination of transcoding sessions and MTP sessions simultaneously. The DSP farm maintains the DSP resource details locally. Cisco Unified Communications Manager requests transcoding services from the gateway, which either grants or denies these requests, depending on resource availability. The details of whether DSP resources are used, and which DSP resources are used, are transparent to Cisco Unified Communications Manager.

The DSP farm uses the DSP resources in network modules on Cisco routers to provide transcoding and hardware MTP services.

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Tip To determine how many DSP resources your router supports, see the "Allocation of DSP Resources" section.

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DSP Farm Profiles

DSP-farm profiles are created to allocate DSP-farm resources. Under the profile you select the service type (transcode or MTP), associate an application, and specify service-specific parameters such as codecs and maximum number of sessions. A DSP-farm profile allows you to group DSP resources based on the service type. Applications associated with the profile, such as SCCP, can use the resources allocated under the profile. You can configure multiple profiles for the same service, each of which can register with one Cisco Unified Communications Manager group. The profile ID and service type uniquely identify a profile, allowing the profile to uniquely map to a Cisco Unified Communications Manager group that contains a single pool of Cisco Unified Communications Manager servers.

Transcoding and MTP

Transcoding compresses and decompresses voice streams to match endpoint-device capabilities. Transcoding is required when an incoming voice stream is digitized and compressed (by means of a codec) to save bandwidth, but the local device does not support that type of compression. Ideally, all IP telephony devices would support the same codecs, but this is not the case. Rather, different devices support different codecs.

Transcoding is processed by DSPs on the DSP farm; sessions are initiated and managed by Cisco Unified Communications Manager which also refers to transcoders as hardware MTPs.

This feature provides transcoding at the remote site, without the need for access to the central site (see Figure 1).

Figure 1 Transcoding Service

Media Termination Point

A Media Termination Point (MTP) bridges the media streams between two connections allowing Cisco Unified Communications Manager to relay calls that are routed through SIP or H.323 endpoints.

The following MTP resources are supported for Cisco Unified Communications Manager 4.0 (formerly known as Cisco CallManager 4.0) and later releases:

•Software MTP—Software-only implementation that does not use a DSP resource for endpoints using the same codec and the same packetization time.

•Hardware MTP—Hardware-only implementation that uses a DSP resource for endpoints using the same G.711 codec but a different packetization time. The repacketization requires a DSP resource so it cannot be done by software only. Cisco Unified Communications Manager also uses the term software MTP when referring to a hardware MTP.

For MTP and transcoding, the DSP farm supports only two IP streams connected to each other at a time. If more than two streams need connecting, the streams must be connected using conferencing.

Allocation of DSP Resources

You must allocate DSP resources on two levels:

•Within the voice network module, between the DSP farm and your voice trunk group that handles standard voice termination

•Within the DSP farm, between transcoding and voice-conferencing services

Allocation of DSP Resources Within the Voice Network Module

You allocate DSP resources either to voice termination of the voice trunk group or to the DSP farm. Occasionally these allocations can conflict.

If you previously allocated DSP resources to voice termination and you now try to configure a DSP farm, you might find that insufficient DSP resources are available. Conversely, if you previously allocated DSP resources to a DSP farm and you now try to configure a trunk group, you might find that insufficient DSP resources are available.

If your requested configuration is rejected, you have two options:

•Insert more DSPs on the voice network module (NM-HDV or NM-HDV2)

•Allocate a different voice network module for either the DSP farm or the trunk group

Allocation of DSP Resources Within the DSP Farm

You should know the following about your system:

•Number of DSPs required to handle your anticipated number of conference calls and transcoding sessions

•Number of DSPs that your system can support

DSP resources can reside in packet-voice DSP modules (PVDM2s) installed in voice network modules or directly in the network module. Cisco VGD 1T3 voice gateway routers have onboard DSP resources located on PVDM2s installed directly on the motherboard. Your router supports up to six voice network modules.

Transcoding Session Capacities

Each DSP is individually configurable to support transcoding and standard voice termination. The total number of transcoding and voice termination sessions is limited by the capacity of the entire system, which includes the DSPs, hardware platform, physical voice interface, and Cisco Unified Communications Manager.

Table 1 and Table 2 list the maximum number of conference calls and transcoding sessions that DSPs can handle, in theory. Actual capacity may be less based on the total system design.

Table 1 DSP Theoretical Session Capacities 

Application	2 PVDM2-64	3 PVDM2-64	4 PVDM2-64
Transcoding
G.711 a-law/u-law <-> G.729a/G.729ab	64 sessions	96 sessions	128 sessions
G.711 a-law/u-law <-> G.729/G.729b	48 sessions	72 sessions	96 sessions
Voice Termination
G.711 a-law/u-law	128 sessions	192 sessions	256 sessions
G.726, G.729a, G.729ab	64 sessions	96 sessions	128 sessions
G.729, G.729b, G.723.1, G.728	48 sessions	72 sessions	96 sessions

Table 2 Theoretical System Capacities for One DSP 

Application	G.711 a-law/u-law	G729 a/ab	G.729, G.729b
Hardware MTP	16 sessions	—	—
Transcoding	8 sessions	8 sessions	6 sessions

Configuring Transcoding and MTP for the Cisco VGD 1T3 Voice Gateway

This section contains the procedures for configuring transcoding and MTP support on Cisco VGD 1T3 voice gateways. The procedures that you perform depend on the type of voice network module you are using to allocate DSP resources:

•Determining DSP Resource Requirements (required)

•Enabling SCCP on the Cisco Unified Communications Manager Interface (required)

•Configuring Transcoding and MTP (required)

Determining DSP Resource Requirements

DSPs reside on PVDM2s that are installed in a voice network module or on PVDM2s that are installed directly onto the motherboard. You must determine the number of PVDM2s or network modules that are required to support your transcoding services and install the modules on your router.

SUMMARY STEPS

1. Determine performance requirements.

2. Determine the number of DSPs that are required.

3. Verify your solution.

4. Install hardware.

DETAILED STEPS

	Command or Action	Purpose
Step 1	Determine the number of transcoding sessions and conference calls that your router must support.	Establishes your performance requirements.
Step 2	Determine the number of DSPs that are required to support the transcoding sessions. If voice termination is also required, determine the additional DSPs required. Example: 8 G.711 conferences and 32 transcoding sessions require 1 PVDM2-64 (4 DSPs).	Establishes your hardware requirements.
Step 3	Ensure that your requirements fall within router capabilities, taking into account whether your router supports multiple network modules. If necessary, reassess performance requirements.	Verifies your proposed solution.
Step 4	Install PVDM2s and network modules, as needed (see the "Connecting Voice Network Modules" chapter in the Cisco Network Modules Hardware Installation Guide, and the Cisco Network Modules and Interface Cards Regulatory Compliance and Safety Information).	Prepares your system for DSP-farm configuration.

Enabling SCCP on the Cisco Unified Communications Manager Interface

Perform this task to enable SCCP on the local interface that the voice gateway uses to communicate with Cisco Unified Communications Manager.

SUMMARY STEPS

1. enable

2. configure terminal

3. sccp ccm {ip-address | dns} identifier identifier-number [port port-number] [version version-number]

4. sccp local interface-type interface-number

5. sccp ip precedence value

6. sccp

7. exit

DETAILED STEPS

	Command or Action	Purpose
Step 1	enable Example: Router> enable	Enables privileged EXEC mode. •Enter your password if prompted.
Step 2	configure terminal Example: Router# configure terminal	Enters global configuration mode.
Step 3	sccp ccm {ip-address | dns} identifier identifier-number [port port-number] [version version-number] Example: Router(config)# sccp ccm 10.0.0.0 identifier 1 version 4.0	Adds a Cisco Unified Communications Manager server to the list of available servers to which the Cisco VGD 1T3 voice gateway can register. •Repeat this step for each Cisco Unified Communications Manager server that the gateway registers with.
Step 4	sccp local interface-type interface-number Example: Router(config)# sccp local Ethernet 1	Selects the local interface that SCCP applications use to register with Cisco Unified Communications Manager.
Step 5	sccp ip precedence value Example: Router(config)# sccp ip precedence 3	(Optional) Sets the IP precedence value for SCCP. •This command enables you to increase the priority of voice packets over connections controlled by SCCP. •value—Range is 1(highest) to 7 (lowest). Default is 5.
Step 6	sccp Example: Router(config)# sccp	Enables SCCP and brings it up administratively.
Step 7	exit Example: Router(config)# exit	Exits global configuration mode.

Configuring Transcoding and MTP

For detailed instructions on how to configure Transcoding on Cisco Unified Communications Manager, refer to the Transcoder Configuration section in the Media Resource Configuration chapter in the Cisco Unified Communications Manager Administration Guide.

For detailed instructions on how to configure MTP on Cisco Unified Communications Manager, refer to the Media Termination Point Configuration section in the Media Resource Configuration chapter in the Cisco Unified Communications Manager Administration Guide.

Configuration Examples for Transcoding and MTP

This section provides the following configuration examples:

•DSP-Farm Services on the Cisco VGD 1T3: Example

•Out-Band to In-Band DTMF Relay: Example

•Out-Band to In-Band DTMF Relay for MTP Device: Example

•SIP Gateway: Example

DSP-Farm Services on the Cisco VGD 1T3: Example

The following example shows a configuration of transcoding services on a PVDM2. DSP farm profile 6, which supports transcoding, is assigned to Cisco Unified Communications Manager group 988.

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Note This configuration requires Cisco IOS Release 12.4(20)YA or later.

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Current configuration : 2661 bytes

!

version 12.4

service timestamps debug datetime msec

service timestamps log datetime msec

no service password-encryption

!

hostname sjl23

!

boot-start-marker

boot-end-marker

!

!

no aaa new-model

ip subnet-zero

!

!

!

ip host boating 223.255.254.254

no ftp-server write-enable

!

voice-card 1

 no dspfarm

 dsp services dspfarm

!

!

voice service voip 

 h323

!

!

!

interface FastEthernet0/0

 ip address 10.4.20.7 255.255.255.0

 no ip mroute-cache

 speed auto

 half-duplex

 no cdp enable

!

interface FastEthernet0/1

 no ip address

 no ip mroute-cache

 shutdown 

 duplex auto

 speed auto

 no cdp enable

!

ip default-gateway 10.4.0.1

ip classless

ip route 0.0.0.0 0.0.0.0 FastEthernet0/0

ip route 223.255.254.254 255.255.255.255 10.4.0.1

no ip http server

!

!

no cdp run

!

!

control-plane

!

!

sccp local FastEthernet0/0

sccp ccm 10.4.20.24 identifier 1 version 4.0

sccp ccm 10.4.20.25 identifier 2 version 4.0

sccp ccm 10.4.20.26 identifier 3 version 4.0

sccp ip precedence 3

sccp

!

sccp ccm group 988

 associate ccm 1 priority 1

 associate ccm 2 priority 2

 associate ccm 3 priority 3

associate profile 6 register MTP123456789988

 keepalive retries 5

 switchover method immediate

 switchback method immediate

 switchback interval 15

!

dspfarm profile 6 transcode

 codec g711ulaw

 codec g711alaw

 codec g729ar8

 codec g729abr8

 codec gsmfr

 maximum sessions 4

 associate application SCCP

!

!

dial-peer cor custom

!

!

dial-peer voice 200 voip

 destination-pattern 111....

 session target ipv4:10.4.205.24

!

dial-peer voice 2600 voip

 destination-pattern 666....

 session target ipv4:10.4.205.24

 codec g711ulaw

!

dial-peer voice 100 voip

 destination-pattern 5550...

 session target ipv4:10.4.205.24

 codec g711ulaw

!

dial-peer voice 10 pots

 destination-pattern 7770000

 forward-digits 0

!

dial-peer voice 11 pots

 destination-pattern 7771111

!

dial-peer voice 999 voip

 session target ipv4:10.4.205.8

!

gateway 

 timer receive-rtp 1200

!

!

line con 0

 exec-timeout 0 0

line aux 0

line vty 0 4

 password test

 login

!

!

end

Out-Band to In-Band DTMF Relay: Example

In the following configuration, the voice gateway acts as both a H.323 gateway and DSP farm.

Building configuration...

Current configuration :2091 bytes

!

version 12.4

service timestamps debug datetime msec

service timestamps log datetime msec

no service password-encryption

!

hostname vgd 1t3

!

boot-start-marker

boot-end-marker

!

no logging console

!

no network-clock-participate wic 1

network-clock-participate wic 2

no network-clock-participate wic 3

network-clock-participate wic 4

mmi polling-interval 60

no mmi auto-configure

no mmi pvc

mmi snmp-timeout 180

no aaa new-model

ip subnet-zero

ip cef

!

!

!

no ftp-server write-enable

isdn switch-type primary-net5

voice-card 0

 dsp services dspfarm

!

!

!

controller T1 2/0:1

 shutdown

 framing esf

 linecode b8zs

!

controller T1 3/0:1

 framing esf

 linecode b8zs

!

!

!

interface FastEthernet0/0

 ip address 192.168.12.21 255.255.255.0

 duplex auto

 speed auto

!

interface FastEthernet0/1

 no ip address

 shutdown

 duplex auto

 speed auto

!

interface BRI4/0

 no ip address

 isdn switch-type basic-net3

!

interface BRI4/1

 no ip address

 isdn switch-type basic-net3

!

ip classless

ip http server

!

!

!

control-plane

!

!

!

voice-port 3/0:1

!

voice-port 3/1:1

!

voice-port 4/0:1

!

voice-port 4/1:1

!

!

sccp local FastEthernet0/0

sccp ccm 192.168.12.131 identifier 1 version 4.0

sccp ip precedence 4

sccp

!

sccp ccm group 1

 bind interface FastEthernet0/0

 associate ccm 1 priority 1

 associate profile 2 register amalthea-mtp

 associate profile 1 register amalthea-xcode

 registration retries 20

 registration timeout 30

 keepalive retries 10

 connect retries 30

 connect interval 30

!

dspfarm profile 1 transcode

 description xcode func

 codec g711ulaw

 codec g711alaw

 codec g729ar8

 codec g729abr8

 codec gsmfr

 codec g729r8

 maximum sessions 2

 associate application SCCP

!

dspfarm profile 2 mtp

 codec g711ulaw

 maximum sessions hardware 2

 maximum sessions software 2

 associate application SCCP

!

!

dial-peer voice 1 pots

 destination-pattern 4444

 port 3/0

!

dial-peer voice 2 voip

 destination-pattern 52..

 session target ipv4:192.168.12.131

 dtmf-relay h245-alphanumeric

!

gateway

 timer receive-rtp 1200

!

!

line con 0

line aux 0

line vty 0 4

 login

!

end

Out-Band to In-Band DTMF Relay for MTP Device: Example

The following running configuration example shows the MTP device configuration.

Building configuration...

Current configuration : 1435 bytes

!

version 12.3

service timestamps debug uptime

service timestamps log uptime

no service password-encryption

!

hostname router1

!

voice-card 1

 no dspfarm

 dsp services dspfarm

!

voice-card 2

 dspfarm

!

no aaa new-model

ip subnet-zero

!

ip host sample 10.10.10.5

mpls ldp logging neighbor-changes

no ftp-server write-enable

no scripting tcl init

no scripting tcl encdir

!

no voice hpi capture buffer

no voice hpi capture destination

!

interface FastEthernet0/0

 ip address 10.4.118.13 255.255.255.255

 duplex auto

 speed auto

!

interface FastEthernet0/1

 no ip address

 shutdown

 duplex auto

 speed auto

!

ip default-gateway 10.4.0.10

ip classless

ip route 10.0.0.0 255.255.255.255 FastEthernet0/0

ip route 223.255.255.255 255.255.255.255 FastEthernet0/0

!

ip http server

!

sccp local FastEthernet0/0

sccp ccm 10.40.10.10 identifier 10 version 4.0

sccp ccm 10.10.10.51 identifier 20 version 4.0

sccp

!

sccp ccm group 999

 associate ccm 10 priority 1

 associate ccm 20 priority 2

 associate profile 12 register MTP123456789

 associate profile 2 register XCODT123456

!

dspfarm profile 2 transcode

 codec g711ulaw

 codec g711alaw

 codec g729ar8

 codec g729abr8

 codec gsmfr

 maximum sessions 2

 associate application SCCP

!

dspfarm profile 12 mtp

 codec g711ulaw

 maximum sessions hardware 4

 maximum sessions software 40

 associate application SCCP

!

SIP Gateway: Example

The following running configuration example shows the SIP gateway configuration for the Out-Band to In-Band DTMF Relay feature.

Building configuration...

Current configuration : 2051 bytes

!

version 12.4

service timestamps debug uptime

service timestamps log uptime

no service password-encryption

!

hostname cisco_sip_gw

!

logging buffered 6000000 debugging

!

voice-card 2

 dspfarm

!

no aaa new-model

ip subnet-zero

!

!

ip domain name cisco.com

ip host sample 10.10.10.5

ip host myhost 10.4.175.2

mpls ldp logging neighbor-changes

no ftp-server write-enable

no scripting tcl init

no scripting tcl encdir

!

!

no voice hpi capture buffer

no voice hpi capture destination 

!

!

ccm-manager mgcp

ccm-manager music-on-hold

ccm-manager config server 10.4.175.2  

ccm-manager config

!

!

controller T1 2/0:1

 framing esf

 linecode b8zs

 ds0-group 1 timeslots 1-24 type e&m-fgb

!

controller T1 2/0:2

 framing sf

 linecode ami

!

!

!

interface FastEthernet0/0

 ip address 10.4.175.14 255.255.0.0

 duplex auto

 speed auto

!

interface FastEthernet0/1

 no ip address

 shutdown

 duplex auto

 speed auto

! 

interface BRI1/0

 no ip address

!

ip default-gateway 10.4.0.1

ip classless

ip route 0.0.0.0 255.255.0.0 FastEthernet0/0

ip route 223.255.254.254 255.255.255.255 FastEthernet0/0

!

ip http server

!

!

voice-port 1/0:0

!

voice-port 1/0:1

!

voice-port 1/1:0

!

voice-port 2/0:1

!

mgcp profile default

!

!

dial-peer voice 1 voip

 destination-pattern 2000

 session protocol sipv2

 session target ipv4:10.4.175.2

 dtmf-relay rtp-nte

 codec g711ulaw

!

dial-peer voice 3 pots

 application mgcpapp

 port 2/0:1

!

dial-peer voice 999201 pots

 application mgcpapp

 port 2/0:1

!

dial-peer voice 2 pots

 destination-pattern 2005

 port 1/0/0

!

dial-peer voice 5 pots

 destination-pattern 2001

 port 1/0/0

!

!

line con 0

line aux 0

line vty 0 4

 login

!

!

end 

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