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Cisco Unified Communications Manager (CallManager)

Unified SRST Interactive Voice Network Configuration Example

Document ID: 82056


Introduction

This series of interactive documents uses a typical head office and branch office in order to demonstrate some common voice network configurations. This interactive diagram allows you to view network configurations:

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This image is interactive!
Click a component to view configuration
and troubleshooting information.

Refer to Unified CallManager Interactive Voice Network Configuration and Troubleshooting Case Study for requirements assumed by this series of interactive documents.

Configure

In order for SRST to function correctly, you must complete these eight configurations:

  1. Create an SRST Reference in CallManager
  2. Configure the Remote RTP Router
  3. Select the SRST Reference in the Remote Device Pool
  4. Configure Dial Peers for Dialing in SRST Mode to the PSTN
  5. Configure Class of Restriction (COR) on the SRST Router
  6. Configure Multicast MOH from Flash (Optional)
  7. Ensure 4-Digit Dialing to the Head Office is Maintained
  8. Configure Voice Mail

Create an SRST Reference in Unified CallManager

In order to create an SRST reference in Unified CallManager, complete these steps:

  1. Click System > SRST > Add a New SRST Reference.
  2. Configure the SRST reference as shown in this image:



    Note: The IP address must match the IP source address specified in the SRST router, which is the RTP router in this example. This address is configured under call-manager-fallback. See Configure the Remote RTP Router.

Configure the Remote RTP Router

In order configure the remote RTP router, use the configuration listed in this step.

Note: The relevant SRST configurations are shown in bold text.

hostname RTP
!
!
application
global
service alternate default
!
controller T1 0/1
framing esf
linecode b8zs
cablelength short 133
channel-group 0 timeslots 1-24 speed 64
!
controller T1 1/0
framing esf
linecode b8zs
pri-group timeslots 1-2,24 service mgcp

interface Serial0/1:0
no ip address
encapsulation frame-relay
!
interface Serial0/1:0.100 point-to-point
bandwidth 128000
ip address 192.168.10.2 255.255.255.0
frame-relay interface-dlci 100
!
interface Serial1/0:23
no ip address
isdn switch-type primary-ni
isdn incoming-voice voice
isdn bind-l3 ccm-manager
no cdp enable
interface Vlan10
ip address 172.69.103.225 255.255.255.0
ip helper-address 171.69.103.225
!
interface Vlan110
ip address 10.10.10.1 255.255.255.0
ip helper-address 171.69.103.225
!
router eigrp 1
network 10.0.0.0
network 171.69.0.0
network 172.69.0.0
network 192.168.10.0
no auto-summary
!
interface FastEthernet2/0
switchport trunk native vlan 10
switchport mode trunk
switchport voice vlan 110
switchport priority extend cos 0
!
interface FastEthernet2/1
switchport trunk native vlan 10
switchport mode trunk
switchport voice vlan 110
switchport priority extend cos 0
!
interface FastEthernet2/2
switchport trunk native vlan 10
switchport mode trunk
switchport voice vlan 110
switchport priority extend cos 0

!
interface Vlan10
ip address 172.69.103.225 255.255.255.0
ip helper-address 171.69.103.225
!
interface Vlan110
ip address 10.10.10.1 255.255.255.0
ip helper-address 171.69.103.225
!
router eigrp 1
network 10.0.0.0
network 171.69.0.0
network 172.69.0.0
network 192.168.10.0
no auto-summary

voice-port 1/0:23

ccm-manager fallback-mgcp
ccm-manager mgcp
ccm-manager music-on-hold
ccm-manager config server 171.69.103.225
mgcp
mgcp call-agent 171.69.103.225 2427 service-type mgcp version 0.1
mgcp dtmf-relay voip codec all mode out-of-band
mgcp rtp unreachable timeout 1000 action notify
mgcp modem passthrough voip mode nse
mgcp package-capability rtp-package
mgcp package-capability sst-package
no mgcp package-capability fxr-package
mgcp package-capability pre-package
no mgcp timer receive-rtcp
mgcp sdp simple
mgcp fax t38 inhibit
mgcp rtp payload-type g726r16 static
!
mgcp profile default

call-manager-fallback
max-conferences 8 gain -6
ip source-address 10.10.10.1 port 2000
max-ephones 3
max-dn 3
dialplan-pattern 1 9195014... extension-length 4

Select the SRST Reference in the Remote Device Pool

In order to ensure that the device pool where SRST is used has been assigned the appropriate SRST resource, complete these steps:

  1. Click System > Device Pool > RTP.
  2. Select the SRST reference from the SRST Reference drop-down list. In this example, Cisco3725.


Configure Dial Peers for Dialing in SRST Mode to the PSTN

In order to allow users make PSTN calls in SRST mode, configure voice dial peers identical to the CallManager dial plan:

dial-peer voice 123 pots !--- For incoming DID calls
incoming called-number .
direct-inward-dial
port 1/0:23
!
dial-peer voice 911 pots
destination-pattern 911
port 1/0:23
forward-digits 3
!
dial-peer voice 9911 pots
destination-pattern 9911
port 1/0:23
forward-digits 3
!
dial-peer voice 7 pots
destination-pattern 9[2-9]......
port 1/0:23
forward-digits 7
!
dial-peer voice 11 pots
destination-pattern 91[2-9]..[2-9]......
port 1/0:23
forward-digits 11
!
dial-peer voice 9011 pots
destination-pattern 9011T
port 1/0:23
prefix 011
!

Configure Class of Restriction (COR) on the SRST Router

In order to maintain class of service (CoS) for users in SRST mode, you must configure COR. For detailed information about COR operation, refer to the Dial Plan section of the Cisco Unified Communications SRND Based on Cisco Unified CallManager 4.x.

The COR configurations that are relevant to this document are shown in this output:

dial-peer cor custom
name int
name local
name ld
name intl
!
!
dial-peer cor list int
member int
!
dial-peer cor list local
member local
!
dial-peer cor list ld
member ld
!

dial-peer cor list intl
member intl
!
dial-peer cor list Restricted
member int
!
dial-peer cor list LocalCalls
member int
member local
!
dial-peer cor list LongDistance
member int
member local
member ld
!
dial-peer cor list International
member int
member local
member ld
member intl

dial-peer voice 911 pots
corlist outgoing int
destination-pattern 911
port 1/0:23
forward-digits 3
!
dial-peer voice 9911 pots
corlist outgoing int
destination-pattern 9911
port 1/0:23
forward-digits 3
!
dial-peer voice 7 pots
corlist outgoing local
destination-pattern 9[2-9]......
port 1/0:23
forward-digits 7
!
dial-peer voice 11 pots
corlist outgoing ld
destination-pattern 91[2-9]..[2-9]......
port 1/0:23
forward-digits 11

dial-peer voice 9011 pots
corlist outgoing intl
destination-pattern 9011T
port 1/0:23
prefix 011

call-manager-fallback
max-conferences 8 gain -6
ip source-address 10.10.10.1 port 2000
max-ephones 3
max-dn 3
dialplan-pattern 1 9195014... extension-length 4
cor incoming International 1 4001
cor incoming LocalCalls 2 4002
cor incoming LongDistance 3 4003

Configure Multicast MOH from Flash (Optional)

In order to provide MOH in SRST mode, you can configure multicast MOH from flash as shown in the output in this section. Note that IP phones hear only tone on hold in SRST mode. However, PSTN callers hear music-on-hold.

call-manager-fallback
max-conferences 8 gain -6
ip source-address 10.10.10.1 port 2000
max-ephones 3
max-dn 3
dialplan-pattern 1 9195014... extension-length 4
moh music-on-hold
multicast moh 239.1.1.1 port 16384 route 10.10.10.1 172.69.103.225

For more information on MOH best practices, refer to the Music on Hold section of Cisco Unified Communications SRND Based on Cisco Unified CallManager 4.x.

Ensure 4-Digit Dialing to Head Office is Maintained

In order to maintain 4-digit dialing for your users to reach the head office during SRST failover, you must configure additional dial peers as shown in this output:

!
voice translation-rule 1 !--- Appends 14085015 to any called number starting with 5
rule 1 /^5/ /14085015/
!
!
voice translation-profile toHQ
translate called 1

dial-peer voice 5000 pots !--- Maintains 4-digit dialing to head office
translation-profile outgoing toHQ
destination-pattern 5...
port 1/0:23
!

Configure Voice Mail

For information on how to configure voice mail, refer to these documents:

Verify

This section provides information to verify your configuration. Cisco recommends that you perform this verification outside of business hours as it will cause an outage for your remote branch if SRST is not triggered.

  1. Test the SRST configuration:

    You can either take down the WAN interface or add a static route to null 0 for any ip packets coming from Unified CallManager:

    ip route 171.69.103.225 255.255.255.255 null 0

    Caution: Use extreme caution when using the above static route. The impact of this can affect other sites depending on your IP routing environment.

    You should see the following messages appear on your remote branch router (in this configuration example, RTP router):
    *Nov 1 06:16:34.707: %IPPHONE-6-REGISTER_NEW: ephone-2:SEP000BBEF9E85E
                     IP:10.10.10.14 Socket:2 DeviceType:Phone has registered.
*Nov 1 06:16:54.375: %IPPHONE-6-REG_ALARM: 15: Name=SEP00115C0E5EDA
                     Load=7.2(4.0) Last=CM-ICMP-Unreach
*Nov 1 06:16:54.375: %IPPHONE-6-REGISTER_NEW: ephone-1:SEP00115C0E5EDA
                     IP:10.10.10.12 Socket:1 DeviceType:Phone has registered.
  2. In order to test PSTN dial, call various numbers and ensure that users CoS are maintained.

  3. Test calls to the head office.

    This debug output was taken by dialing 5005 to head office. Notice how this number is translated to 14085015005. 
    RTP#debug voice translation
    
RTP#
*Nov 1 06:27:46.363: //-1/xxxxxxxxxxxx/RXRULE/
                     regxrule_get_profile_from_trunkgroup_internal:
                     Voice port 0x66A943AC does not belong to any trunk group
*Nov 1 06:27:46.363: //-1/EC2B8D52804D/RXRULE/
                     regxrule_stack_pop_RegXruleNumInfo: stack=0x66A93B98; count=1
*Nov 1 06:27:46.367: //-1/EC2B8D52804D/RXRULE/
                     regxrule_stack_push_RegXruleNumInfo: stack=0x66A93B98; count=0
*Nov 1 06:27:47.627: //-1/EC2B8D52804D/RXRULE/
                     regxrule_stack_push_RegXruleNumInfo: stack=0x66A93B98; count=1
*Nov 1 06:27:47.627: //-1/EC2B8D52804D/RXRULE/
                     regxrule_profile_translate_internal: number=19195014003
                     type=unknown plan=unknown numbertype=calling
*Nov 1 06:27:47.627: //-1/EC2B8D52804D/RXRULE/
                     regxrule_get_RegXrule: Invalid translation ruleset tag=0
*Nov 1 06:27:47.627: //-1/EC2B8D52804D/RXRULE/
                     regxrule_profile_match_internal: Error: ruleset for calling
                     number not found
*Nov 1 06:27:47.627: //-1/EC2B8D52804D/RXRULE/
                     regxrule_profile_translate_internal: No match: number=19195014003
                     type=unknown plan=unknown
*Nov 1 06:27:47.627: //-1/EC2B8D52804D/RXRULE/
                     regxrule_profile_translate_internal: number=5005 type=unknown
                     plan=unknown numbertype=called
*Nov 1 06:27:47.627: //-1/EC2B8D52804D/RXRULE/
                     regxrule_profile_match_internal: Matched with rule 1 in ruleset 1
*Nov 1 06:27:47.627: //-1/EC2B8D52804D/RXRULE/
                     regxrule_profile_match_internal: Matched with rule 1 in ruleset 1
*Nov 1 06:27:47.627: //-1/EC2B8D52804D/RXRULE/
                     sed_subst: Successful substitution; pattern=5005 matchPattern=^5
                     replacePattern=14085015 replaced pattern=14085015005
*Nov 1 06:27:47.627: //-1/EC2B8D52804D/RXRULE/
                     regxrule_subst_num_type: Match Type = none, Replace Type = none
                     Input Type = unknown
*Nov 1 06:27:47.631: //-1/EC2B8D52804D/RXRULE/
                     regxrule_subst_num_plan: Match Plan = none, Replace Plan = none
                     Input Plan = unknown
*Nov 1 06:27:47.631: //-1/EC2B8D52804D/RXRULE/
                     regxrule_profile_translate_internal: xlt_number=14085015005
                     xlt_type=unknown xlt_plan=unknown
*Nov 1 06:27:47.631: //-1/EC2B8D52804D/RXRULE/
                     regxrule_profile_translate_internal: number= type=unknown
                     plan=unknown numbertype=redirect-called
*Nov 1 06:27:47.631: //-1/EC2B8D52804D/RXRULE/
                     regxrule_get_RegXrule: Invalid translation ruleset tag=0
*Nov 1 06:27:47.631: //-1/EC2B8D52804D/RXRULE/
                     regxrule_profile_match_internal: Error: ruleset for redirect-called
                     number not found
*Nov 1 06:27:47.631: //-1/EC2B8D52804D/RXRULE/
                     regxrule_profile_translate_internal: No match: number= type=unknown
                     lan=unknown
*Nov 1 06:27:47.631: //-1/EC2B8D52804D/RXRULE/
                     regxrule_dp_translate: calling_number=19195014003 calling_octet=0x0
                     called_number=14085015005 called_octet=0x80 redirect_number= redirect_type=0 
                         redirect_plan=0 redirect_PI=0 redirect_SI=0
*Nov 1 06:27:47.631: //-1/EC2B8D52804D/RXRULE/
                     regxrule_vp_translate: No profile found in voice port or trunk group
                     for outgoing direction
*Nov 1 06:27:47.631: //-1/EC2B8D52804D/RXRULE/
                     regxrule_vp_translate: calling_number=19195014003 calling_octet=0x0
                     called_number=14085015005 called_octet=0x80 redirect_number= redirect_type=0 
                         redirect_plan=0

Updated: Apr 16, 2007Document ID: 82056