SIP setting

Unanswered Question
Jan 29th, 2009

Dear all,

I have cisco ccm 5.1 in my office. i have nokia e61i phone i configuared my phone over the sip and its working really fine. in my internal network but when i leave my network i try from another network or thorough 3G i am able to register on my cisco CMM thorough public IP. and i am also able to make calls but the thing is the second party not able to hear me. can anyone suggest me how i move forward

I have this problem too.
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yhung Thu, 01/29/2009 - 15:23

I would check if a firewall might be blocking some of the traffic. Does it happen on all types of calls?

Jonathan Schulenberg Thu, 01/29/2009 - 17:41

I would strongly recommend against exposing your UC Manager server to the outside world directly. This is a significant security risk.

If you are absolutely determined to do this, you will need to do protocol inspection of the RTP traffic on your firewall as RTP dynamically assigns ports. This is in addition to inspecting SCCP or SIP.

You should be doing this inside of a protected tunnel. Cisco offers the Phone Proxy feature on their ASA products although I'm not sure this is compatible with third-party SIP devices. Otherwise, you should VPN in and then place the call.

fahadrazi Fri, 01/30/2009 - 07:08

hmm thank you soo much i will try some possibilities if i have some more clarification i wll contact you again thanksss :)

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