asterisk users - Jun 2006 - Cisco router and "488 Not acceptable here" messages

Are there any known problems with Cisco routers (Cisco 837) and SIP
sessions? I have been trying to track down a problem for about 3 hours
now and I think the Cisco router is the culprit!!!

I keep getting "488 Not acceptable here" messages, which are
apparently
normally the message you get when a common codec can't be found. I'm
also getting "chan_sip.c:3434 process_sdp: Insufficient information for
SDP (m = '', c = '')" messages, which is strange because
the m and c
attributes are definitely there.

When I looked closer, they are received on the first INVITE, then
asterisk says 'proxy auth required', but the INVITE packet with the
proxy auth doesn't have the attributes. A tcpdump on the asterisk server
confirms this.

But, when I do a ethereal dump on my PC where I'm running SJphone, the
attributes are there in the packet.

So something is futzing with my packets, and screwing them up. There is
a Cisco router on my end of the link, so I'm suspecting that!

Any suggestions?

Thanks

James

Additionally, just to satisfy myself that I wasn't going mad I changed
the port from 5060 to 5070 and now things are working, so something is
definitely playing up on port 5060.

James
> -----Original Message-----
> From: asterisk-users-bounces@lists.digium.com [mailto:asterisk-users-
> bounces@lists.digium.com] On Behalf Of James Harper
> Sent: Monday, 12 June 2006 00:58
> To: Asterisk Users Mailing List - Non-Commercial Discussion
> Subject: [Asterisk-Users] Cisco router and "488 Not acceptable
here"
> messages
> 
> Are there any known problems with Cisco routers (Cisco 837) and SIP
> sessions? I have been trying to track down a problem for about 3 hours
> now and I think the Cisco router is the culprit!!!
> 
> I keep getting "488 Not acceptable here" messages, which are
apparently
> normally the message you get when a common codec can't be found.
I'm
> also getting "chan_sip.c:3434 process_sdp: Insufficient information
for
> SDP (m = '', c = '')" messages, which is strange
because the m and c
> attributes are definitely there.
> 
> When I looked closer, they are received on the first INVITE, then
> asterisk says 'proxy auth required', but the INVITE packet with the
> proxy auth doesn't have the attributes. A tcpdump on the asterisk
server
> confirms this.
> 
> But, when I do a ethereal dump on my PC where I'm running SJphone, the
> attributes are there in the packet.
> 
> So something is futzing with my packets, and screwing them up. There
is
> a Cisco router on my end of the link, so I'm suspecting that!
> 
> Any suggestions?
> 
> Thanks
> 
> James
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