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Why VoIP "codec g729r8 pre-ietf" command works only to one direction?

I have two routers for VoIP purposes. One of them has 12.0-4T IOS and the other one has 12.1-7 IOS. That is why I use the "codec g729r8 pre-ietf" on the adequate voip peer of the newer software release router.

If I initiate the voip call from the newer router side everything is working properly, but otherwise I just hearing "gulping sound".

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Anonymous
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Re: Why VoIP "codec g729r8 pre-ietf" command works only to one d

Beginning with IOS 12.0(5)T, the default bit-ordering of the G.729 codec is changed from a pre-IETF standard format to the IETF standardized format. The two formats do not interoperate, and in

fact will result in an unintelligible " gulping sound" that you hear.

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