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SPA504 not registering with external SIP gateway behind 887W router

Hello,

I have a cisco 887W router with several SPA504 phones that are not able to fully register to send and receive calls, inbound the phones will ring but no audio heard either way.

At the moment I have NAT'd udp 5060 direct to a single phone and turned off SIP & SIP-TLS inspection on the routers CBAC firewall, and

"no ip nat service sip udp port 5060" This allows only a single phone to work.

On the 877 routers this has not been an issue as long as they were a recent IOS and had ip inspection switched on for SIP but with this 887 running

c800-universalk9-mz.SPA.151-4.M3.bin i have had no joy.

Has anyone seen this problem before?

Thanks in Advance.

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Beginner

Re: SPA504 not registering with external SIP gateway behind 887W

Have you tried forwarding UDP 10000-20000? Port UDP 5060 sets up the SIP call, but does not carry audio.