Cisco ip phone 9971 registration failed with CME 8.6 on WAN

[hanimolani]

Subject: Cisco ip phone 9971 registration failed with CME 8.6 on WAN

I have a WAN simulation with one Cisco2811 router one Cisco1841 router (connected with fast Ethernet interface) plus one layer 2 switch.

I upgraded the 2811 IOS to 15.4M and installed CME8.6, when we tried to add 9971 sip phone If the traffic goes throw LAN (Same subnet- directly from switch to 2811) everything is fine and the SIP phone (9971) added with no problem but when I change the subnet and traffic goes throw WAN

( from 1841 routed to 2811 with default route) my phone didn't register.

It will be great if anybody could help!!

If you can solve my problem, I will be happy to compensate.

[Steven Smith]

You need to make sure that the phone has a route to the interface running CUCME and that firewalls aren't blocking this.  But, you are going to have some difficulty if you are trying to have a private address scheme on the inside interface of the router that isn't available on the outside.  I don't believe that SSL VPN for SIP phones is currently supported on CUCME, so a hardware VPN might be required to get this to work.

If the phone was a 79X5 phone, you could make the phone have an SSL VPN.