Hi all,
We've got a number of users connected in a configuration which is basically:
(a)
SIP Phones -> Asterisk -> IAX -> Our Asterisk -> Cisco AS 5xxx (SIP) -> PSTN
We also have users in a configuration:
(b)
SIP Phones -> Asterisk -> IAX -> Our Asterisk -> Digium E1 -> PSTN
The second server in both cases is the same.
The SIP phones place a call via these configurations to the PSTN
Users in configuration (b) are happy. Some users in configuration (a) complain that <x> seconds into the call, the called party suddenly hears silence for <y> seconds, and then call corrects itself.
Finally, we also have users in configuration (c):
SIP Phones -> Proxy -> SER -> Cisco AS 5xxxx -> PSTN
These users are also perfectly happy.
I suspect, given the history of SIP/IAX/SIP timestamps, something is being 'changed' which upsets the Cisco gateway resulting in the silences being sent.
Any ideas or suggestions?
Linus
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