Cisco Unified Communications Manager and Interoperability Configuration Guide, Cisco IOS Release 15M&T
Configuring MGCP-Controlled Backhaul of BRI Signaling
Configuring MGCP-Controlled Backhaul of BRI Signaling
Last Updated: December 6, 2012
The MGCP-Controlled Backhaul of Basic Rate Interface (BRI) Signaling in Conjunction with Cisco Unified Communications Manager feature provides MGCP service to remote-office gateways that connect by means of ISDN BRI trunks to a centralized Cisco Unified Communications Manager.
Feature benefits include the following:
Only the ETSI BRI basic-net3 switch type is supported.
Feature History for MGCP-Controlled Backhaul of BRI Signaling in Conjunction with Cisco Unified Communications Manager
Finding Support Information for Platforms and Cisco IOS Software Images
Use Cisco Feature Navigator to find information about platform support and Cisco IOS software image support. Access Cisco Feature Navigator at http://www.cisco.com/go/fn . You must have an account on Cisco.com. If you do not have an account or have forgotten your username or password, click Cancel at the login dialog box and follow the instructions that appear.
For more information about this and related Cisco IOS voice features, see the following:
Finding Feature Information
Your software release may not support all the features documented in this module. For the latest caveats and feature information, see Bug Search Tool and the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the feature information table at the end of this module.
Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required.
Prerequisites for MGCP-Controlled Backhaul of BRI Signaling
Cisco Voice Gateway
Restrictions for MGCP-Controlled Backhaul of BRI Signaling
Information About MGCP-Controlled Backhaul of BRI Signaling
MGCP-Controlled Backhaul of BRI Signaling
The MGCP-Controlled Backhaul of BRI Signaling feature supports a centralized Cisco Unified Communications Manager architecture with BRI trunks connected to remote branch offices. Transporting signaling information from a branch-office MGCP gateway to a centralized media-gateway controller for processing is called backhaul. D-channel signal information is backhauled to Cisco Unified Communications Manager through a TCP session. All Q.931 messages are passed through the TCP connection between the Cisco MGCP gateway and Cisco Unified Communications Manager. The MGCP gateway neither parses nor has any knowledge of the contents of those messages.
This feature enables you to connect remote ISDN PBXs and key systems to a Cisco ISDN BRI network termination (network side) or PSTN Class 4/5 switch through a Cisco ISDN BRI terminal equipment (as user side) interface. External call-control entities, such as one or more Cisco Unified Communications Manager servers, provide voice service between local and remote branch offices.
The figure below depicts a typical network-side scenario. NT denotes network termination; TE denotes terminal equipment.
The figure below shows a typical user-side scenario.
The following is the sequence of events during normal backhaul:
How to Configure MGCP-Controlled Backhaul of BRI Signaling
Configuring the BRI Interface as an MGCP-BRI Backhaul Endpoint
Verifying MGCP-BRI Backhaul Configuration
Tips for Troubleshooting MGCP-Controlled Backhaul of BRI Signaling
The table below lists commands that are available for troubleshooting your configuration.
Configuring SRTP Mode on Cisco IOS MGCP Gateways
SRTP mode provides secure VoIP calls by addressing security requirements for privacy, integrity, and confidentiality of voice conversations. IPsec, a standards-based set of security protocols and algorithms, ensures that signaling information that is sent between the gateway and Cisco Unified Communications Manager are encrypted. Media encryption using standards-based Secure Real-Time Transport Protocol (SRTP) ensures that media streams between supported devices are secure.
Perform this task to configure SRTP mode on the gateway.
Before You BeginSUMMARY STEPS
You should first establish an IPsec connection between Cisco Unified Communications Manager and the MGCP gateway before using the MGCP SRTP package. Otherwise, media keys are sent in clear text and your voice call is not considered secure.
Configuration Examples for MGCP-Controlled Backhaul of BRI Signaling
MGCP BRI Backhaul on Cisco 3745 Example
Router# show running-config Building configuration... Current configuration :3913 bytes ! version 12.3 service timestamps debug datetime msec service timestamps log datetime msec no service password-encryption ! hostname Router ! boot-start-marker boot-end-marker ! ! no network-clock-participate slot 1 no network-clock-participate slot 2 no network-clock-participate slot 3 no network-clock-participate slot 4 no network-clock-participate wic 0 no network-clock-participate wic 1 no network-clock-participate wic 2 no network-clock-participate aim 0 no network-clock-participate aim 1 no aaa new-model ip subnet-zero ip cef ! ! ! ip dhcp pool phone1 host 10.3.102.102 255.255.0.0 client-identifier 0100.1121.116b.dd option 150 ip 10.3.102.99 default-router 10.3.102.2 ! ! ip domain name cisco.com ip ids po max-events 100 no ftp-server write-enable isdn switch-type basic-net3 voice-card 1 no dspfarm ! voice-card 2 no dspfarm ! voice-card 3 no dspfarm ! ! ! ccm-manager switchback immediate ccm-manager fallback-mgcp ccm-manager redundant-host 10.3.102.98 ccm-manager mgcp ! ! ! interface FastEthernet0/0 ip address 10.3.102.2 255.255.0.0 duplex auto speed auto ! interface FastEthernet0/1 no ip address shutdown duplex auto speed auto ! interface BRI1/0 no ip address isdn switch-type basic-net3 isdn incoming-voice voice isdn bind-l3 ccm-manager service mgcp isdn skipsend-idverify ! interface BRI1/1 no ip address isdn switch-type basic-net3 isdn protocol-emulate network isdn layer1-emulate network isdn incoming-voice voice isdn skipsend-idverify ! interface BRI2/0 no ip address isdn switch-type basic-net3 isdn incoming-voice voice isdn bind-l3 ccm-manager service mgcp isdn skipsend-idverify ! interface BRI2/1 no ip address isdn switch-type basic-net3 isdn protocol-emulate network isdn layer1-emulate network isdn incoming-voice voice isdn skipsend-idverify ! interface BRI3/0 no ip address isdn switch-type basic-net3 isdn incoming-voice voice isdn bind-l3 ccm-manager service mgcp isdn skipsend-idverify ! interface BRI3/1 no ip address isdn switch-type basic-net3 isdn protocol-emulate network isdn layer1-emulate network isdn incoming-voice voice isdn skipsend-idverify ! ! ip default-gateway 10.3.0.1 ip classless ip route 0.0.0.0 0.0.0.0 10.3.0.1 ! ip http server no ip http secure-server ! ! access-list 10 deny 10.3.102.99 log access-list 10 permit any ! ! ! control-plane ! ! call application alternate DEFAULT ! ! voice-port 1/1/0 ! voice-port 1/1/1 ! voice-port 2/0/0 ! voice-port 2/0/1 ! voice-port 3/0/0 ! voice-port 3/0/1 ! voice-port 3/1/0 ! voice-port 3/1/1 ! voice-port 3/1/2 ! voice-port 3/1/3 ! ! mgcp mgcp call-agent 10.3.102.99 service-type mgcp version 0.1 mgcp package-capability srtp-package ! mgcp profile default ! ! ! dial-peer voice 1 pots application mgcpapp direct-inward-dial port 3/0/0 forward-digits all ! dial-peer voice 100 voip application mgcpapp destination-pattern 9... session target ipv4:10.3.102.1 incoming called-number . ! dial-peer voice 2 pots destination-pattern 5001 port 3/1/0 ! dial-peer voice 4 pots destination-pattern 6T direct-inward-dial port 3/0/1 ! dial-peer voice 3 pots destination-pattern 5002 port 3/1/3 ! dial-peer voice 11 pots destination-pattern 2T direct-inward-dial port 2/0/1 ! dial-peer voice 12 pots application mgcpapp direct-inward-dial port 2/0/0 forward-digits all ! ! ! call-manager-fallback max-conferences 8 ip source-address 10.3.102.2 port 2000 max-ephones 2 max-dn 4 ! ! line con 0 exec-timeout 0 0 line aux 0 line vty 0 4 login ! end
MGCP BRI Backhaul on Cisco 3640 Example
version 12.2 service timestamps debug uptime service timestamps log uptime no service password-encryption no service dhcp ! hostname 3640 ! ! voice-card 3 ! ip subnet-zero ! ! ip domain name cisco.com ! isdn switch-type primary-qsig ! ! voice call carrier capacity active ! voice service voip h323 call start slow ! ! ! ! mta receive maximum-recipients 0 ccm-manager mgcp ! controller T1 3/0 framing esf clock source internal linecode b8zs pri-group timeslots 1-24 service mgcp ! controller T1 3/1 framing esf linecode b8zs ! ! ! interface FastEthernet0/0 ip address 10.15.43.101 255.255.0.0 duplex auto speed auto no cdp enable ! interface Serial0/0 no ip address encapsulation frame-relay shutdown clockrate 125000 frame-relay lmi-type ansi ! interface FastEthernet0/1 no ip address shutdown duplex auto speed auto ! interface Serial0/1 no ip address shutdown clockrate 125000 ! interface BRI1/0 no ip address isdn switch-type basic-net3 isdn incoming-voice voice isdn bind-l3 ccm-manager service mgcp ! interface BRI1/1 no ip address isdn switch-type basic-qsig ! interface Serial3/0:23 no ip address no logging event link-status isdn switch-type primary-qsig isdn incoming-voice voice no cdp enable ! ip default-gateway 10.15.10.11 ip classless ip route 0.0.0.0 0.0.0.0 10.15.10.11 ip http server ! ip pim bidir-enable ! ! ! call rsvp-sync ! voice-port 1/0/0 ! voice-port 1/0/1 ! voice-port 2/0/0 ! voice-port 2/0/1 ! voice-port 2/1/0 ! voice-port 2/1/1 ! voice-port 3/0:23 ! mgcp mgcp call-agent 10.14.181.10 service-type mgcp version 0.1 mgcp sdp simple ! mgcp profile default ! ! ! dial-peer cor custom ! ! ! dial-peer voice 6000 pots application mgcpapp port 2/0/0 ! dial-peer voice 4000 pots application mgcpapp port 2/0/1 ! ! line con 0 exec-timeout 0 0 line aux 0 line vty 0 4 login ! ! end
Where to Go Next
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