09-29-2008 08:22 AM - edited 03-15-2019 01:36 PM
SIP Phone 7911G (SIP11.8-4-1S) when call outside show 'Connected' during 'ringing' so I try to see the 'debug voip ccapi inout' but I don't really understand, can someone help me or give me some reference?
09-30-2008 12:33 PM
Is your connection to the PSTN a POTS line?
09-30-2008 12:42 PM
Yes, why?
09-30-2008 12:50 PM
An FXS/FXO does not have setup acknowledge, progress indication, and etc. like ISDN and other signaling protocols. The ringing and connect are in-band, so the gateway will send back that is it connected as soon as it grabs the line.
-steve
10-01-2008 04:30 AM
In this case why it's work with SCCP phone?
10-01-2008 09:48 AM
I would imagine that the same thing happens with a SCCP phone, except that, when using SIP, the call is 'connected' with the H.323 or MGCP-controlled gateway while it is ringing. With SCCP, the phone only receives call control commands from the Call Manager.
10-01-2008 09:49 AM
Edit: I meant to say "when using SCCP", not "when using SIP".
10-01-2008 10:04 AM
So it's normal and I can do nothing to correct that's?
10-01-2008 11:11 AM
That is interesting. I would have expected the callmanager to map the signaling from the MGCP/H323 gateway to the equivalent SCCP and SIP messages.
I was not able to find a solution when I noticed this with an IOS gateway using a SIP trunk to an FXO. Your setup is different.
If you have loop-start FX, "supervisory answer dualtone" in the voice port config may change what is signaled to the callmanager, and possibly ba mapped differently.
Unfortunately, I no longer have any FXO lines in my lab, so I cannot try this myself.
-steve
10-01-2008 11:17 AM
Same here, all this, is for one of my customer and in my lab I don't have what it take to test. My client tell me he already test with the command "supervisory answer dualtone" on the voice port of his MGCP gateway but... I would like to test it myself...
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