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Community Member

Unable to hear audio from one side on IP Communicator

Hi All,

We have installed IP Communicator 7.0 and the same is getting registed to the Call Manager 3.3(5).

But the issue is we are able to hear only one side of the audio.

When we place a call to the physical IP Phone from the IP Communciator, the audio from the IP communicator is audiable to the IP Phone, but the IP Phone audio is not audiable to the IP Communicator.

What could the problem be. We have disabled firewall on the PC, we are using Cisco PIX 515E firewall where Fixup protocol TFTP, H323, SIP is enabled.

Any suggestion welcomed !!!

Regards,

Dayanand Naik

4 REPLIES
Hall of Fame Super Gold

Re: Unable to hear audio from one side on IP Communicator

You have a problem with the Firewall, recommend you eliminate it from the path, or have its configuration reviewed by an expert.

Community Member

Re: Unable to hear audio from one side on IP Communicator

Paolo is right, if the FW is on the way it should be stateful and its security policy set up to open UDP/RTP sessions after SIP/H.323 call is setup.

however, if both phones are hosted in same CUCM or CUCME, FW never knows about the call setup and do not dynamically sets up an open path for the call.

I guess both you phone and computer are on the same LAN and FW is not between (you might even have the PC using the ethernet port on the phone) and routing are setup properly you should be able to have both way conversation. Most of the cases voice is getting blocked somewhere in the network.

Re: Unable to hear audio from one side on IP Communicator

Like the others stated it could be a firewall issue so start there. One other thing to check as well, i have seen one way audio from this. If you are using your IP communicator on a laptop and are connected to a wireless network you may have configured in call manager its lan adapters mac address and now on wireless it is using the mac address of the wireless adapter. Your best option is to configure a name to use for registration rather than mac addresses with ip communicator then you dont have to worry about it using different adapters whether you are wired or wireless.

Community Member

Re: Unable to hear audio from one side on IP Communicator

I assume you use voice VLAN. IP Communicator will use the data VLAN,  check your firewall if you added a rule for the udp port range 16384 to 32764 from your data VLAN to voice VLAN.

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