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Cisco 881 Router inspect SIP

danhed7400
Level 1
Level 1

hi.

im in the progress of Configuring a Cisco 881 Router, for a branch office.

Behind this Router they have an PBX, is it prossible to inspect SIP packet using CBAC, and thereby open for RSTP pinholes.

i only have 1 Public ip adresser, and im not fond of configuring thousands of PAT to the PBX.

i have with success, Accomplished this with Global Inspection on ASA Firewalls, but i dont know if this can be done with IOS as well.

1 Accepted Solution

Accepted Solutions

You can search for "SIP ALG" or similar terms.

Thank you for the nice rating and good luck!      

View solution in original post

5 Replies 5

paolo bevilacqua
Hall of Fame
Hall of Fame

You don't need to do anything for that to happen.

Cisco NAT automatically opens needed ports based on content the SIP messages.

ok, so i only need to forward UDP/5060 to the PBX, and then it would work ?

i thought i needed to inspect SIP and RTP so the required dynamic ports would be opened as needed

Correct. You don't need to anything else.

Please remember to rate useful posts clicking on the stars below.

ok thx

do u have a link that tells more about the Cisco NAT Feature regaring SIP content

You can search for "SIP ALG" or similar terms.

Thank you for the nice rating and good luck!      

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