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Community Member

One Way Audio on Conference Call

I am having a problem with conference calling. I have a customer who has one way audio on outside conf call. When three IP phones do an IP phone only conf call, not involving a gateway the conf call works fine.

However, when a ip phone calls an outside caller then does an add hoc conf call the original party cannot hear anyone on the conf bridge. The problem seems related to who is called and not the order they are added to the conf call.

I am thinking that this is an ISDN signaling issue. I have verified the ISDN switch type and router config. They are all ok.

I am running a 3640 with a single NM-HDT-T1 and 12.1.(3a)XI5.

Has anyone run into this before??

Community Member

Re: One Way Audio on Conference Call

I had the same exact problem. I had to add the command (voice rtp send-recv) in the config. This fixed our problem.

Community Member

Re: One Way Audio on Conference Call

What version of code were you running to use voice trp send-recv.

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