It's similar to this problem https://supportforums.cisco.com/thread/2020752/ I checked the encoding dosn't hold true for my problem, So here is the problem have two offices 1 main with 20Mb down and 20Mb up, the branch office is connected over S2S VPN they have a T1, when you transfer a call from a phone in the main office to a phone it the branch office it rings and you are able to get there voicemail if they pick up then you get disconnected as in the thread i posted above, you can transfer from the attetdant console no problem. If you want me to post the running config of the 2 routers let me know, other wise just tell me what section you want since they are 5 pages in ms word.
If the call drops when the user answers, that is almost always a codec mismatch. You need to describe the entire topology of the call flow. Mention how the call comes into the network, and what protocols (both voip and pots) are being used for the call flow.
Then, we can take it from there.
If you post text output, please attach in .txt format and not .doc format.
We have 2 T1's one for local and one for long distance, all calls between 8:30am and 6pm go to the attendant console which she can transfer anywhere with success, if you transfer an outside call to a 7962 in the main office and then transfer it to the branch office it get dropped. I attached the config of the main and branch office. Hope this is enough info
Since these are h323 gateways, CM is going to use an ECS for a transfer. First, try adding these commands, which should be added on any h323 gateway to CM since it does ECS and doesn't support h450:
voice service voip
no supp h450.2
no supp h450.3
If you still have issues after this, collect these debugs for a failure from both devices:
debug isdn q931
debug vpm sig
debug voip ccapi inout
debug h225 asn1
debug h245 asn1
debug cch323 all
Collect the debugs in this manner:
Router(config)# service sequence Router(config)# service timestamps debug datetime msec Router(config)# logging buffered 10000000 7 Router(config)# no logging con Router(config)# no logging mon Router(config)# voice iec syslog Router# term len 0 Router# sh logg
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