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Table Of Contents
MGCP Basic CLASS and Operator Services
Related Features and Technologies
Supported Standards, MIBs, and RFCs
Troubleshooting MGCP Basic CLASS and Operator Services Configurations
MGCP Basic CLASS and Operator Services
This feature module describes the Media Gateway Control Protocol (MGCP) Basic CLASS and Operator Services (BCOS) features, and includes:
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Supported Standards, MIBs, and RFCs
Feature Overview
The MGCP BCOS are a set of calling features, sometimes called "custom calling" features, that use MGCP to transmit voice, video, and data over the IP network. These features are usually found in circuit-based networks. MGCP BCOS brings them to the Cisco IOS gateways on packet-based networks.
The MGCP BCOS software is built on the MGCP CAS PBX and AAL2 software package, and supports MGCP 0.1 and the earlier protocol versions Simple Gateway Control Protocol (SGCP) 1.1 and 1.5.
The following MGCP BCOS features are available on Residential Gateways (RGWs) and Business Gateways (BGWs):
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The following two features can be run as RGW or trunking gateway (TGW) features:
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This feature is supported in SGCP mode on Cisco uBR924, Cisco 3660, and Cisco AS5300 platforms and in MGCP mode on all five supported platforms.
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This feature is supported on the Cisco 3660 and Cisco AS5300 TGW platforms and on the Cisco MC3810 series, Cisco 2600, and Cisco uBR924 RGW platforms. This feature cannot be supported on the G.728 and G.723 codecs.
Distinctive Power Ring
A telephone rings in a distinctive pattern when a call comes in from a predefined telephone number. The following patterns are available:
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Visual Message Waiting Indicator
A light will go on when a message is waiting for the line.
Caller ID
The calling party's telephone number, date, and time of the call appear on the receiving telephone's display between the first and second rings. A maximum of 18 digits are shown., and private and unlisted numbers are displayed. If the called party answers the phone on the first ring, the calling party's number does not appear.
If the called party has an appropriate name display unit, the calling party's name and telephone number appear on the display. The name and number appear between the first and second rings.
If the calling party has blocked Caller ID from displaying the telephone number, the called party sees "P" for private or "Anonymous" on the display unit.
Caller ID with Call Waiting
If the called party has Caller ID and has enabled the Call Waiting feature, then the calling party's name (if an appropriate display unit is available) and telephone number appear while the called party is on the line with another call.
If the calling party has blocked Caller ID from displaying the name and telephone number, the called party will see "P" for private or "Anonymous" on the display unit.
Call Forwarding
The following scenarios are available:
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Ring Splash
Also known as Reminder Ring, Ring Splash is activated when the user enables Call Forwarding on the telephone. The user hears Distinctive Power Ring R5 when the line is idle and a call has been forwarded. This reminds the user that Call Forwarding is active.
Distinctive Call-Waiting Tone
The called party hears four audible tone patterns (waiting tones, or WTs) when a call is waiting on the called party's line. The call agent provides the following tone patterns in sequence as the incoming call continues to wait:
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Message Waiting Tone
For users with an active voice mail system, a special dial tone is heard when the user goes off-hook and a message is waiting. The dial tone is a sequence of 10 short tones followed by a steady tone. If the user has a telephone with a visual message indicator, the indicator light goes on when a message is waiting.
Stutter Dial Tone
This tone is used in place of the dial tone to indicate that a message is waiting. When the user goes off-hook, a sequence of three short tones followed by a steady tone is heard.
Off-Hook Warning Tone
The user hears this tone when the telephone is off-hook. The tone is repeated bursts of sound of rising pitch.
911 Calls
The user can make a 911 call to an Emergency Service Bureau (ESB), and the call is maintained as long as the ESB does not hang up. If the user hangs up, the call is maintained. If the user hangs up and picks up the phone again, the call resumes. If the user hangs up and does not pick up the phone again, the ESB can ring the user and resume the call.
This feature is available in SGCP mode on the Cisco uBR924, Cisco 3660, and Cisco AS5300 platforms and in MGCP mode on all supported platforms.
Three-way Calling (TWC)
The user can create a 3-way call by pressing the switchhook quickly to put the first call on hold, dial a third party, and press the switchhook again quickly to join all parties to the call. This feature is supported on all five platforms.
Caveats for Three-way Calling:
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Examples of Service Provider Solutions
The Basic CLASS and Operator Services features support MGCP solutions in the following areas:
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A CLEC can use residential cable access to provide residential customers with basic telephony and data services. CLASS features and Three-way calling, Caller ID with Call Waiting, and Distinctive Call Waiting Tone are features that support these customers. Figure 1 illustrates a possible residential cable access solution:
Figure 1 Residential Cable Access Solution
Note that in Figure 1, the residential gateway (the Cisco uBR924 platform) must support the CLASS features and 911 capability.
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In these solutions, a call agent provides business voice services that are traditionally offered by a circuit-based PBX. CLASS features and Three-way calling, Caller ID with Call Waiting, Distinctive Call Waiting Tone, and Visual Message Waiting Indicator are features suitable for these customers. Figure 2 illustrates an IP Centrex solution:
Figure 2 IP Centrex Solution
In Figure 2, the residential gateway (the Cisco uBR924 and Cisco 2600 series platforms) must support the CLASS features.
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A CLEC or IXC can provide small, medium, and large businesses with integrated voice and data access services. The integrated access device can be located at the central office or on the customer's premises. Access to the subscriber can be analog or digital, and transport of voice and data can be over IP, Frame Relay, or ATM. CLASS features and Three-way calling, Caller ID with Call Waiting, Distinctive Call Waiting Tone, and Visual Message Waiting Indicator are features suitable for these customers. Figure 3 illustrates an integrated access solution:
Figure 3 Integrated Access Solution
In Figure 3, the residential gateway (the Cisco 2600 series and Cisco MC3810 series platforms) must support the CLASS features.
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Figure 4 illustrates a telecommuter or small office-home office solution:
Figure 4 Telecommuter or Small Office-Home Office Solution
In Figure 4, the residential gateway (the Cisco uBR924 platform) must support the CLASS features.
Other solutions are possible using the MGCP open protocol.
Benefits
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Restrictions
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To check the type of DSP card in your Cisco MC3810 series platform, enter a show version command at the EXEC prompt. For example: Router# show version
If you have an HCM card, the following line appears as part of the show version information:
1 6-DSP (slot 2) High Performance Compression Module(v01.A0)
If you have an VCM card, the following line appears as part of the show version information:
1 6-DSP (slot 2) Voice Compression Module(v255.V7)
If you have the HCM card, the MGCP BCOS features will function properly. If you have the VCM card, the feature is not supported.
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Related Features and Technologies
Voice over IP (VoIP)
Related Documents
General reference documents:
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http://www.cisco.com/univercd/cc/td/doc/product/software/ios121/121cgcr/multi_r/index.htm
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http://www.cisco.com/univercd/cc/td/doc/product/software/ios121/121cgcr/multi_c/index.htm
Feature documents:
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http://www.cisco.com/univercd/cc/td/doc/product/software/ios121/121newft/121t/121t3/mgcp1213.htm
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Product documents:
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http://www.cisco.com/univercd/cc/td/doc/product/cable/cab_modm/ubr924/scg924/index.htm
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http://www.cisco.com/univercd/cc/td/doc/product/access/acs_mod/cis3700sw_conf/37_swcf/index.htm
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http://www.cisco.com/univercd/cc/td/doc/product/access/acs_mod/1700/1750/1750voip/index.htm
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http://www.cisco.com/univercd/cc/td/doc/product/access/acs_serv/5300/53swcf2/index.htm
Supported Platforms
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Supported codecs:
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Supported Standards, MIBs, and RFCs
Standards
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MIBs
XGCP-MIB
RFCs
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Prerequisites
Complete the following tasks before configuring this feature:
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For more information on IP routing, refer to Cisco IOS IP and IP Routing Configuration Guide at:
http://www.cisco.com/univercd/cc/td/doc/product/software/ios121/121cgcr/ip_c/index.htm
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For more information on configuring voice ports, refer to Cisco IOS Multiservice Applications Configuration Guide at:
http://www.cisco.com/univercd/cc/td/doc/product/software/ios121/121cgcr/multi_c/index.htm
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For more information on configuring Voice over IP, refer to Cisco IOS Multiservice Applications Configuration Guide at:
http://www.cisco.com/univercd/cc/td/doc/product/software/ios121/121cgcr/multi_c/index.htm
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For more information on setting up call agents, refer to the documentation that accompanies the call agents used in your network configuration.
Configuration Tasks
No special configuration tasks are required to initiate MGCP BCOS. MGCP BCOS co-resides with MGCP CAS PBX and AAL2 PVC software, for which configuration activities are required. These are discussed in MGCP CAS PBX and AAL2 PVC at:
http://www.cisco.com/univercd/cc/td/doc/product/software/ios121/121newft/121limit/121x/121xm/121xm_5/ftmgcpba.htm
Troubleshooting MGCP Basic CLASS and Operator Services Configurations
The following MGCP BCOS features do not work on telephones from all manufacturers when the telephones are connected to a Cisco MC3810 series platform:
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The following table summarizes the findings for the models tested:
To correct this operation, change the idle voltage in the voice port from low to high.
To change the voice port idle voltage, perform these additional steps:
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Configuration Examples
No new or modified configuration settings are needed to implement MGCP Basic CLASS and Operator Services. Please refer to MGCP CAS PBX and AAL2 PVC at the following site for sample configurations:
Command Reference
No new or modified configuration commands are needed to implement MGCP Basic CLASS and Operator Services. Please refer to MGCP CAS PBX and AAL2 PVC at the following site for more information on the MGCP commands:
http://www.cisco.com/univercd/cc/td/doc/product/software/ios121/121newft/121limit/121x/121xm/121xm_5/ftmgcpba.htm
Debug Commands
No new debug commands are needed for MGCP Basic CLASS and Operator Services. Please refer to MGCP CAS PBX and AAL2 PVC at the following site for more information on the MGCP debug commands:
http://www.cisco.com/univercd/cc/td/doc/product/software/ios121/121newft/121limit/121x/121xm/121xm_5/ftmgcpba.htm
Glossary
AL2—ATM Adaptation Layer 2
AAL5—ATM Adaptation Layer 5
BGW—see Business Gateway
Business Gateway—An xGCP media gateway which is a business customer premises equipment that has connection(s) to the VoIP network as well as connection(s) to the user's telephony equipment (typically a PBX, a corporate LAN or WAN). Such gateways are used to eliminate or reduce the need for individual medium (voice, data, and so forth) connectivity.
CA—Call Agent
Call Agent—An intelligent entity in an IP telephony network which handles call control in an MGCP model Voice over IP network.
CAS—Channel Associated Signaling
CCS—Common Channel Signaling
CID—AAL2 Channel Identifier
CLASS—Custom Local Area Subscriber Services, usually referred to as "Custom Calling" features
DS-0—64 kbps channel in a T1/E1 line
DTMF—Dual Tone Multi-frequency
E&M—Ear and Mouth analog signaling
FXO—Foreign Exchange Operator—An interface from a telephone to a PSTN central office or a station interface on a PBX.
FXS—Foreign Exchange Station—An interface that connects to a telephone, key set, or PBX to supply ring, voltage, and dial tone.
Media Gateway—Equipment that connects the PSTN or a PBX with the VoIP network. It is controlled by a call agent via MGCP.
MGC—Media Gateway Controller. Another name for Call Agent.
MGCP—Media Gateway Control Protocol
Package—A set of signals and events that define a type of voice endpoint or connection. Examples include line-package, trunk-package, dtmf-package, and atm-package. See the commands mgcp default-package, page 65, and mgcp package-capability, page 76, for more information on using these packages.
PRI—ISDN primary rate interface
PSTN—Public Switched Telephone Network
PVC—Permanent Virtual Circuit
Residential Gateway—An xGCP media gateway which is customer premises equipment that has connection(s) to the VoIP network as well as connection(s) to user's telephony equipment.
RGW—see Residential Gateway
RTCP—RTP Control Protocol. The protocol monitors an RTP connection and conveys information about the on-going session.
RTP—Real-Time Transport Protocol. The protocol provides end-to-end network transport functions for applications transmitting real-time data and services such as payload type identification, sequence numbering, timestamping, and delivery monitoring.
SGCP—Simple Gateway Control Protocol
SPVC—Soft Permanent Virtual Circuit
SVC—Switched Virtual Circuit
TGW—see Trunking Gateway
Trunking Gateway—An xGCP media gateway that provides connectivity between the PSTN and VoIP networks.
TSE—Inband Telephony Signaling Events
VAD—Voice Activity Detection
VCC—Virtual Channel Connection (used where it may be a PVC, SPVC, or SVC)
VoIP—Voice over IP
VToA—Voice Trunking on ATM
