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...e to make a call from SIP Phone -> Asterisk -> Avaya -> Station (phone) and vice versa. I am also able to make a call from SIP Phone -> Asterisk -> Avaya -> PSTN. However I face problems when I make DID calls from the PSTN. The DID calls are made through analog DID lines to the TN753 on the Avaya. When I make the call, I can hear ringing on the caller phone (PSTN) and the SIP Phone rings. But when I pick up the SIP Phone, the caller phone remains in ringing mode. On the SIP Phone, I hear random sound. I did a packet capture and on the Q.931 setup information header, under...