Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. And see here for current known issues.

New Member

iax/sip traffic

HI ,

I want to allow iax traffic through the ASA 7.2.2.

Is there a inspect available for that .

We do have sip inspect also I want to know the adv of passing iax traffic rather than sip traffic through the ASA

Raj

1 REPLY
Cisco Employee

Re: iax/sip traffic

Hi Raj,

IAX, and more specifically, IAX2, which is the version of IAX currently is in use, does not need any type of inspection because audio and signalling are unified, unlike SIP. To allow IAX traffic through the ASA you only need to allow traffic to UDP port 4569 in your inbound ACL (plus the static to forward this traffic to your PBX).

Regarding the advantage of passing IAX2 traffic instead of SIP traffic, well, that depends on what your PBX uses. If your PBX only uses SIP then there is no point in letting IAX2 go through. If your PBX can use both SIP and IAX2 to talk to other PBXs/devices the IAX2 seems like a better option.

Take a look at this good comparison between the two written by one of the authors of the IAX protocol:

http://www.voip-info.org/wiki-IAX+versus+SIP

This other link touches on some points regarding NAT and IAX:

http://www.voip-info.org/wiki-IAX

Hope this helps.

Cheers,

Eloy Paris.-

587
Views
4
Helpful
1
Replies