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New Member

SIP traffic through firewall

I Have a PABX Siemens in my inside network, and I need access this PABX with the SIP Protocol, but it does not work. I'm redirect all ip traffic from the ip xxx.xxx.xxx.149 to PABX IP, and setup all ACL's to permit.

My firewall is a CISCO asa 5510, ASA version 8.0(3).

anybody can help me?

14 REPLIES

Re: SIP traffic through firewall

Are you enabling SIP inspection?

Have a look at this link:

http://www.cisco.com/en/US/products/ps6120/products_configuration_example09186a008081042c.shtml#configs1

Regards

Farrukh

New Member

Re: SIP traffic through firewall

Yes... the "Sip Inspection" is already enabled.

Re: SIP traffic through firewall

Which Siemens model/series is this exactly?

Regards

Farrukh

New Member

Re: SIP traffic through firewall

Siemens HiPath 3000...

Re: SIP traffic through firewall

Have you tried to permit all IP traffic from one IP phones IP address to the back (and vice versa)? To see what ports are utilized.

Regards

Farrukh

New Member

Re: SIP traffic through firewall

yes... all traffic from the ip phone to PABX and vice versa already allowed...

Re: SIP traffic through firewall

So it should work then? You permitted all IP traffic, howcome it won't work!

Have you tried toggling the sip inspection on/off?

Regards

Farrukh

New Member

Re: SIP traffic through firewall

Yes... a already tried toggling the sip inspection on/off, but don't work. The IP phone success register on SIP server, but on the calling is muted on two points...

New Member

Re: SIP traffic through firewall

Dear can u increase the timeout of sip and sip media.

Regards,

New Member

Re: SIP traffic through firewall

how to make this?

Re: SIP traffic through firewall

Re: SIP traffic through firewall

You'll find here a very good document for configuring Voice over ASA

http://cisco.com/en/US/customer/products/ps6120/products_configuration_example09186a008081042c.shtml

Probably what happens is that even if you have SIP inspection, the NAT will not translate IP in the embedded data in the SIP packets.

You probably need to enable STUN service on the SIP PBX. STUN is used to detect NAT and will ensure correct IP information is sent in the SIP payload.

Please rate if this helped.

Regard,

Daniel

New Member

Re: SIP traffic through firewall

I'm solved this problem changing the version of ASA software, from 8.0(2) to 7.2.4. After changed this software version, the SIP communication has be worked successful.

Re: SIP traffic through firewall

Ok great, Thanks for the update.

Regards

Farrukh

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