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alexx-alexx

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SIP ISP -> KC (NAT) -> SIP Server

Facing the following issue:

Having configured SIP server behind NAT (Kerio Control) calls are set up and teared down as it should.
But... On incoming calls from the network there's one way audio - local SIP user does not recive media from network. From TCP dump it's seen that ISP's SIP server recieves LAN IP address in "From" field from KC.

SIP ALG is turned off.

Please advise.

Thank you in advance!
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ksnyder

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Have you exhausted all of the suggestions in http://kb.kerio.com/1387 ?

Some common issues:
- UDP Ports 10000 - 20000 not opened
- Extension-->Advanced settings (extension behind NAT)

Ken Snyder
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alexx-alexx

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That is not all about Connect... The softswitch is produced by other vendor.
The goal is to find a solution for firewall (Kerio Control) in this case.
SIP Provider recieves IP address of local subnet (192.168.10.132) on the Switch in "From" field and sends RTP to this local address. Accordingly RTP stream can not be routed in a right way.

But thank you anyway for the suggestion!
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ksnyder

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I should never respond first thing in the morning. Assumed it was a Kerio Operator question (not the first time I've made this mistake).

Ken Snyder
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ksnyder

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Do you have a screen-shot of your traffic rule that you can attach? Does two-way audio kick in after a period of time (60 seconds for example)?

Ken Snyder
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UnifiedTechs-Brian

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alexx-alexx wrote on Wed, 27 January 2016 12:45

SIP Provider receives IP address of local subnet (192.168.10.132) on the Switch in "From" field and sends RTP to this local address. Accordingly RTP stream can not be routed in a right way.


Have you set up the phone system so that it knows it is behind NAT and knows to reference its public IP in communications with your SIP server. For example if you were talking about a Kerio Operator box behind any firewall that is what I would suggest as the phone system controls what is referenced in the "From" field, not the firewall.

[Updated on: Thu, 28 January 2016 20:49]


- Brian
Kerio Preferred Partner, Reseller & Hosting Provider
Unified Technology Solutions
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