The gateways with Time-Division Multiplexing (TDM) bus capability include platforms with a Multiservice Interchange (MIX) capability running a Cisco IOS Software version that supports the network-clock-participate command.
These are platforms and Cisco IOS Software versions for cases with TDM bus capability:
The 3660 platform with the MIX-3660-64 card installed and running Cisco IOS Software version 12.1(5)XM, 12.2T, 12.3 mainline or later
The 3725, 3745 and 2691 platforms running Cisco IOS Software version 12.2(13)T or later
The Cisco IOS Software automatically assumes that you want to use local-bypass (no Digital Signal Processor (DSP) resources) for the hairpin calls, and it cannot be switched off.
Therefore, to obtain two-way audio, the network-clock-participate commands referred to in Cisco bug ID CSCeb77249 are mandatory.
The gateways with no TDM bus capability include platforms with no MIX capability, or platforms with MIX capability but running a Cisco IOS Software version that does not support the network-clock-participate command.
These are platforms and Cisco IOS Software versions for cases without TDM bus capability:
The 3660 platform without the MIX-3660-64 card installed and running any Cisco IOS Software version
The 3725, 3745 and 2691 platforms running Cisco IOS Software versions earlier than 12.2(13)T, which is the first version to recognize the network-clock-participate command
When the hairpin call between the different High Density Voice Network Modules (NM-HDVs) is made, the Cisco IOS Software automatically uses DSPs on each NM-HDV to complete the call, thereby allowing two-way audio.
Therefore, the network-clock-participate commands are not required.
To check whether DSPs are in use on a particular platform, issue the show voice call summary command on the completed call.
This is a sample output of the show voice call summary command on a 3745 platform running a Cisco IOS Software release (in this case 12.2(11)T10) in which the network-clock-participate command is not available. It shows that the DSPs are in use and the hairpinned call is successful:
W1MS-11.7-3745-A#sh voice call sum PORT CODEC VAD VTSP STATE VPM STATE ============ ======== === ==================== ====================== 1/0:15.1 g711ulaw y S_CONNECT S_TSP_CONNECT 1/0:15.2 - - - 2/0:15.1 g711ulaw y S_CONNECT S_TSP_CONNECT 2/0:15.2 - - -
This is a sample output of the show voice call summary command on the same 3745 platform running a Cisco IOS Software release (in this case 12.2(15)T10) where the network-clock-participate command is available. This output allows you to verify that there are no DSPs in use for the hairpin call. Although the call is established, no audio is available until the network-clock-participate commands are issued for the appropriate slots on the gateway:
W1MS-11.7-3745-A#sh voice call sum PORT CODEC VAD VTSP STATE VPM STATE ============ ======== === ==================== ====================== 1/0:15.1 None y S_CONNECT S_TSP_CONNECT 1/0:15.2 - - - 2/0:15.1 None y S_CONNECT S_TSP_CONNECT 2/0:15.2 - - -
In general, hairpin calls automatically use DSPs if you do not have a MIX-capable chassis. If you have a MIX-capable chassis, local-bypass (no DSP resources) is used, and you need to set the proper clock participation. This is important, as the new c2691, c3725 and c3745 platforms are all MIX capable. Therefore, for hairpin calls between different NM-HDVs to work, you must issue the network-clock-participate commands in global configuration mode.
This is an example of the required configuration for a gateway with NM-HDV in slots 2 and 4, respectively:
Router#conf t Enter configuration commands, one per line. End with CNTL/Z. Router(config)#network-clock-participate slot 2 Router(config)#network-clock-participate slot 4 Router(config)#^Z
hello, we have a cisco UCCX server installed and working properly.Then out manager ask we must get a report about only work hours and another report about non-working hours but these report is not beeing in uccx reports. And I want to know where...
ello Experts , I am trying to use the record voice element feature in CVP as part of a project . The objective is to collect the audio captures from customer. Preferred approach is to detect the silence from customer end instead of customer manually ...
I have CUCM 11.5, Expressway 12.5.6, Room kit mini with latest software, CMS 2.4I have registered room kit mini as MRA via Expressways, I am unable to do adhoc conference on them, when I select Add button to do a conference & call the second party, I ...
Hi I need urgent help on once issue. I need to configure Multicast on my layer 2 and layer 3 switches for Voice Paging server. Singlewire paging server connected with core and end IP phone on layer 2 switches. I need to configure Multicast on layer 2 and ...
DX80 Ce9.7.1CM version 11.5.1TMS 15.4.0 DX80 is registered on the CM and can make VTC call in and out. Problem: NTP status TMS error when adding it. Wrong Provisioning Mode How do I clear the wrong provisioning mode err...