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3640 voip call negotiation

we are running a toll bypass scenario with two Meridian PBX's connected over a link using QSIG signalling. While trouble shooting a problem I noticed the following during a call set up with the 'sh call active voice' command

Total call-legs: 2

AA7 : 60964970hs.1 +-1 pid:5 Answer 536 connected

dur 00:00:00 tx:0/0 rx:0/0

IP 172.16.5.2:17322 rtt:0ms pl:0/0ms lost:0/0/0 delay:0/0/0ms g729r8 pre-ietf

AA7 : 60965288hs.1 +-1 pid:9 Originate 90191262 connecting

dur 00:00:00 tx:0/0 rx:0/0

Tele 1/0:15 (3474): tx:0/0/0ms None noise:0 acom:0 i/0:0/0 dBm

Total call-legs: 2

AA7 : 60964970hs.1 +-1 pid:5 Answer 536 connected

dur 00:00:00 tx:0/0 rx:0/0

IP 172.16.5.2:17322 rtt:0ms pl:0/0ms lost:0/0/0 delay:0/0/0ms g729r8 pre-ietf

AA7 : 60965288hs.1 +-1 pid:9 Originate 90191262 connecting

dur 00:00:00 tx:0/0 rx:0/0

Tele 1/0:15 (3474): tx:0/0/0ms None noise:0 acom:0 i/0:0/0 dBm

Total call-legs: 2

AA7 : 60964970hs.1 +1665 pid:5 Answer 536 active

dur 00:00:03 tx:0/0 rx:0/0

IP 172.16.5.2:17322 rtt:0ms pl:0/0ms lost:0/0/0 delay:0/0/0ms g711alaw

AA7 : 60965288hs.1 +1347 pid:9 Originate 90191262 active

dur 00:00:03 tx:185/29361 rx:116/18082

Tele 1/0:15 (3474): tx:3800/2280/0ms g711alaw noise:-67 acom:2 i/0:-63/-37 dBm

It shows the call being set up with the g729r8 pre-ietf codec despite the config dictating g711a.

Does anyone know if this is normal??

1 REPLY
Cisco Employee

Re: 3640 voip call negotiation

I think that it is showing that while it does the media exchange to decide on the correct codec. It does decide on g.711ulaw but when the call is getting setup it uses g.729r8 until the 2 sides agree on g.711.

Hope this helps.

Thank you,

-Mckee

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