7921G can't talk with another 7921G

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May 4th, 2008
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Hello, i have trouble with 7921G ip phones. I use them with a cisco ap with 2 vlans : a voice vlan 1 (it is the native vlan) and with a vlan data 40.

My phone register them to the ccm. I can call other phones devices (7960) but when i call a 7921 from an other 7921, the communication is established (the phone rings and there is a communication ) but i have no audio stream.

my ccm is the version 6.0.1

my phone have the firmware 1.1.1

I think it could be the fact that my native vlan and my vlan voice are the same? I have enable the arp cache and i have no peer to peer acl enabled on my ap.

thanks to help me

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gogasca Sun, 05/04/2008 - 19:36
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Check your routing RTP stream between phones is being block somehow

Which VLAN each phones resides?

spiecomcisco Mon, 05/05/2008 - 04:32
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I found the problem. The native vlan of my ap was the same that my voice vlan. So i have configured an other native vlan and now it works.

thanks for help


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