[SR-Users] cisco spa502g issues

Ben Kramer ben at TelcoEdge.com.au
Fri Mar 17 06:31:50 CET 2017

Hi guys,

we have a bunch of SIP phones behind a fire wall, with our kamalio 
server out on the internet. Most of them are the older SPA92x series, 
but we have some new SPA502g's.

We have no problems calling between 92x and 502's. How ever the 502's 
calling each other do not get voice path.

I have noticed that the phones REGISTER differently:

         AOR:: 5546@<our domain>
                 Contact:: sip:5546@<OUR OFFICE IP>:1032 Q=
                         Expires:: 180
                         Callid:: 4754c4f9-c67e1018 at
                         Cseq:: 43112
                         User-agent:: Cisco/SPA502G-7.6.2a
                         State:: CS_DIRTY
                         Flags:: 0
                         Cflag:: 0
                         Socket:: udp:<OUR SR IP>:5060
                         Methods:: 6815

         AOR:: 5590 at sip.skunkworks.net.au
                 Contact:: sip:5590 at Q=
                         Expires:: 1154
                         Callid:: 24435738-224b06db at
                         Cseq:: 8012
                         User-agent:: Linksys/SPA921-5.1.8
                         Received:: sip:<OUR OFFICE IP>:1026
                         State:: CS_SYNC
                         Flags:: 0
                         Cflag:: 64
                         Socket:: udp:<OUR SR IP>:5060
                         Methods:: 4767

The older 921 has its private IP in the contact, where as the newer 502 
has the external IP of our office in the contact.

Our file wall is a Watchguard T-10 (latest updates etc) with the SIP-ALG 

Any thoughts on where to start looking ?



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