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About voip E&M problem

I have a 3662 with 4xE&M card (config it type I 2-wire) and a cisco 2611 with 4xE&M card(config it type I 4-wire) . Two router has benn connected by a E1 line .Cisco Ios version is 12.2.2T enterprise plus. PBX is Nortel's.I can dial from 3662 to 2611,the is usually. but when I dial from 2611 to 3662 ,I can't hear any voice form other end,but other end can hear my voice .Please help me !!thank you very much.


Re: About voip E&M problem

Since there has been no response to your post, it appears to be either too complex or too rare an issue for other forum members to assist you. If you don't get a suitable response to your post, you may wish to review our resources at the online Technical Assistance Center ( or speak with a TAC engineer. You can open a TAC case online at

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New Member

Re: About voip E&M problem


If you have voice over IP (VOIP) technologies.

Use the following global configuration command

voice rtp send-recv in the privilege mode on both routers.

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