We are using redundant CallManager with 2600s as voice gateways and 7960s for phones. If we dial outbound to another phone system with an automated call attendant we miss the first 5 - 10 seconds of the call when the attendant answers. Also most of the prompts are missed by callmanager(phone system). This happens with at least two autoated attendants that I know of. Whats up?
You should be running Cisco IOS version 12.1(5)T on your 2600. That should fix the problem with the delay on the audio cut-through with automated systems. Make sure you look at the 2600 memory requirements before installation.
SIP traces provide key information in troubleshooting SIP Trunks, SIP
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