Ive seen this pretty regularly, often times it happens when there are
multiple sip servers in the path, and the final 200ok with SDP takes a
second to get to the endpoint. Especially when something that does
symmetric latching is in the path. Its not uncommon for symmetric
latching to cause this as the called audio will start flowing the moment
it sends the 200ok, but the 200ok still has to be received by the caller
and it has to begin sending audio for the latch to take and have the
audio routed both ways.
The answer is typically a 0.5 second delay at the start of your prompt
to insulate against this.
On 6/13/2014 9:07 AM, Brian Taylor wrote:
We have customers who are reporting that when people call into them
that the beginning of the greeting is not being heard.
It appears that the phones think the call is ready before there is a
complete audio path. We see this the most on calls that come in from
the PSTN. Long distance or toll free calls are the worst.
We have a Broadworks system that uses Lucent 5010 (Telica) switches
for the connections to the PSTN.
The symptom seems to be very similar for all of our PSTN connections,
to multiple carriers.
I'm just curious if anyone has any experience with this problem, or if
anyone has any suggestions to get to the bottom of the issue.
Any assistance or inspiration would be greatly appreciated.
Thank you,
Brian Taylor
Socket Telecom, LLC
[email protected]
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