[cisco-voip] Incoming calls from SIP trunk

[Evi Pekou]

I have a SIP trunk between CCM 4.1.3 and Asterisk using G.711 codec and 
CCM MTP resources.
Outgoing calls work fine, while incoming calls are droped after 18 seconds 
of conversation.
Traces show that Callmanager sends OK messages but does not get any ACK 
messages, so it drops the connection.
 Any ideas?
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