Hi,
I have a two-line ATA[1]. Recently I had an intermittent problem where the caller would not hear ringing. After the configured number of seconds, the voicemail greeting would kick in. I could call back and I would hear ringing when I dialed.
When no ringing was heard by the caller, the phone connected to the ATA would not ring either.
Two changes were suggested by the VoIP provider:
Set NAT Keep Alive Enabled: to Yes - this was set to No on the DID line. Oops.
Set NAT Mapping Enable: to Yes
They also suggested to change the SIP port from the default 5060 to 5080.
The problem seems to be resolved. As I like to understand what happened, I asked them what could have been the fix: the port number change or enabling NAT Keep Alive Enabled: They said the latter.
As I think about it, shouldn't NAT'ing handle IP/port numbers?
Each line on the ATA was configured to a different VoIP server. Each was using port 5060.
Thoughts?
Thx!
-pablo
References
[1] - Cisco SPA122
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