Debugging VOIP with Shikha Sharma #CiscoKid

========================================================================== Frame Relay router ! interface Serial0/0/0  description *** static DCE connection to s1 Prasit  no ip address  encapsulation frame-relay  clock rate 2000000  frame-relay intf-type dce  frame-relay route 150 interface Serial0/1/0 130  frame-relay route 170 interface Serial0/2/0 180 ! interface Serial0/1/0  description *** static DCE connection to s0 spicy  bandwidth 1000000  no ip address  encapsulation frame-relay  tx-ring-limit 100  tx-queue-limit 100  transmitter-delay 10  frame-relay intf-type dce  frame-relay route 130 interface Serial0/0/0 150  frame-relay route 140 interface Serial0/2/0 160 ! interface Serial0/2/0  description *** static DCE connection to s1 Aton  ip address 192.168.22.1 255.255.255.0  encapsulation frame-relay  frame-relay intf-type dce  frame-relay route 160 interface Serial0/...

Building configuration... Current configuration : 3093 bytes ! version 12.4 service timestamps debug datetime msec service timestamps log datetime msec no service password-encryption ! hostname PSTN-CME-VG ! boot-start-marker boot-end-marker ! no aaa new-model clock timezone India 5 30 network-clock-participate slot 1 voice-card 0  no dspfarm ! voice-card 1  dspfarm ! voice-card 2  dspfarm ! dot11 syslog no ip dhcp use vrf connected ip dhcp excluded-address 192.168.15.1 192.168.15.10 ! ip dhcp pool PSTN-Phones    network 192.168.15.0 255.255.255.0    default-router 192.168.15.2    option 150 ip 192.168.15.2 ! ! ip cef ! ! multilink bundle-name authenticated ! isdn switch-type primary-ni ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! archive  log config   hidekeys ! ! controller T1 1/0/0  framing esf  clock source internal  linecode b8zs  pri-group timeslots 1-12,24 ! controller T1 1/0/1  framing esf  linecode...

Fractional PRI with MGCP is not supported. But there is a workaround. To avoid any problems you can busy out channels that are not in use on the Gateway from the ccmadmin pages. This way Callmanager will not try to use channels that are unavailable. This is a workaround. Here is the bug ID- CSCdw78580 From CCMAdmin pages go to System > Service Parameters > Service Parameter Configuration > Clusterwide Parameters (Device - PRI and MGCP Gateway) -> Change B-Channel Maintenance Status 1 B-Channel maintenance status for PRI and CAS interfaces in real time for  troubleshooting. Input Format: Device Name = B-channel Maintenance Status Example: S0/DS1-0@SDA123456789ABC = 0000 1111 0000 0000 0000 0001 (24 bits for  T1. Channel number begins with 1 to 24 from left to right.* In the case of PRI, the last bit specifies the D Channel*, which does not get  affected. *In this example, the 5th through 8th B-Channels are out of service.*) or, S1/DS1-0@DLS2-CM136-VG200-2.S...

Essentially only three steps are required to configure MGCP gateway. R1(config)#mgcp R1(config)#ccm-manager config R1(config)#ccm-manager mgcp server <Primary TFTP IP address> R1(config)#ccm-manager redundant-host <Secondary TFTP IP address> --- this command is optional, as suggests it provides secondary TFTP server as a redundant host. A couple of important points to keep in mind : 1. Configure domain name on the gateway and configure gateway configuration on CUCM with the correct domain name. 2. Bind media with the source interface- R1(config)#mgcp bind control source-interface <> R1(config)#mgcp bind media source-interface <> 3. As soon as you configure pri-group timeslots with service mgcp under controller, it'll b ind Lthe ayer 3 of the ISDN PRI interface of the MGCP voice gateway to the CUCM for PRI Q.931 signaling backhaul support interface Serial0/0/0:23 isdn bind-l3 ccm-manager