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michele.ls

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Hi everyone!

I have a trouble with a costumer that has two kerio operator working in two different bases ("base A" and "base B").
In each base there is a kerio operator connected to the local lan with a switch.There is a firewall that allow access to internet through a nat.
In each base there is an ip phone ("ip phone A" and "ip phone B") configured with two extensions: the first one with kerio operator "base A" (same NAT) and the second one with kerio operator "base B" (ip public "base B"). Each kerio operator server works using 5060 and rtp 10000/19999 ports.
Communication between "ip phone A" and kerio operator "base B" and vice versa sometimes works without audio.
What's wrong? Can you explain me how to configure firewall port forwarding and ip phone extension if there are more than one ip phone on the same lan?

Best regards.
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Vladimir Toncar (Kerio)

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Hi,

See http://kb.kerio.com/article/configuring-nat-821.html

Have a look at the scenario called 'Kerio Operator is in the company network and hardware phones are behind NAT'. You in fact need to apply it twice.

Both Operators need to be configured as being behind NAT. Also the remote extensions need to be configured as being behind NAT - for example, if extension 10 on Operator A is registered on a phone in network B, then 10 needs to have "Behind NAT" checked.

BTW, did you consider configuring interfaces interconnecting the two Operators? That could lead to a simpler design.

Vladimir
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michele.ls

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Sorry but I don't understand what you mean exactly when you say "did you consider configuring interfaces interconnecting the two Operators?".

Michele
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Vladimir Toncar (Kerio)

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Operator allows you to create a SIP interface to another PBX. See http://kb.kerio.com/article/connecting-head-office-with-bran ch-offices-818.html

Vladimir
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