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Accessing SIP proxy through Cisco 837 doesn't work - registration not possible

I've been banging my head for days.  Has someone got SJPhone 1.65 configured through a Cisco 837 ADSL router with the firewall feature set enabled?

I'm using draytel.org, but I've got the same issue with other providers such as Sipgate making it most likely to be a router config issue.  Same SJPhone (SIP client) config works just fine on an "open" connection to the internet, so it's not a client config issue.

An example config to let SIP proxy connections behind a NAT'd Cisco 837 would be gold!


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Umh... can you post your configuration? Maybe a "show ip nat trans" can be helpful too...
Try to disable the Cisco builtin SIP ALG and see what appens...

no ip nat service sip udp port 5060
engerdAuthor Commented:
As requested - here's a dumbed down config with the relevant bits.  My IOS knowledge is pretty good, it's SDM that's throwing me the wobbly here.  I really don't want to have to hand code these router configs, and it would be nicer to know what SDM does and why.

Disabling Cisco SIP ALG makes no difference.

engerdAuthor Commented:

It just started working - I didn't give SJPhone time to register properly.

Disabling the Cisco builtin SIP ALG did the trick.

Why do they bother!

Would love to know why it was broken, but full points to pierky in any case!

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