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AS5350 with AS5300

Our partner is using AS5350 and we have problem with g729r8 codec between these gateways.

We use codec = g729r8, payload size = 20 bytes on both ends, but when AS5300 terminating calls I see calls with pre-ietf codec

22E6 : 30114375hs.147859 +338 +357 pid:3 Answer xxxx

dur 00:00:00 tx:0/0 rx:0/0 2C (no requested circuit.)

IP x.x.x.x:18770 rtt:0ms pl:0/0ms lost:0/0/0 delay:0/0/0ms g729r8 pre-ietf

About 30% of all calls come with right g729r8 codec (non pre-ietf) and AS5300 can successfully terminate them. But pre-eitf calls get "dsp error" on further dial-peers.

1353 : 30163075hs.147862 +-1 +347 pid:9821 Originate xxxx

dur 00:00:00 tx:0/0 rx:10/1600 AC (dsp error)

IP x.x.x.x:18892 rtt:0ms pl:0/0ms lost:0/0/0 delay:0/0/0ms clear-channel

(Call passes PSTN Loopback before reaching this dial-peer)

I've read that AS5350 doesn't support real g729r8 and g729br8 high-complex codecs, but it support only medium-complex g729 ones. Can this be the cause of problem?


Re: AS5350 with AS5300

Are the pre-ietf codecs coming from a cisco gateway. If they are then you can upgrade that router, to something higher than 12.1 and it will not send pre ietf anymore. ALternatively you can configure your 5350 to negotiate the pre ietf codec, by configuring g729 pre-ietf under the dial peer or voice class.


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