Remote office. CallManager 8.6 at the main office and a 2901 router in the remote office H323 trunk between the offices.
Extension dialing works. Calls into the office via outside line works. Calls from that office to the outside world, however, the employee cannot hear the person they called but the outside person can hear the employee.
It is a site to site connection with all ports open.
I did a debug isdn q931 on the router and set up a virtual phone here in the HQ. When I call the phone I get the debug messages. When I use the virtual phone to dial out, no debug messages. I cannot replicate the issue remotely here though.
Anyone have any guidence where I can look for a solution on this?
When a phone registers to UCM, it needs to be able to connect to UCM. However, when a call is setup, only the signaling messages go to UCM, the media flows directly between the endpoints ie. in your case between the phone and the interface that is configured for H323. Media doesnt flow through UCM in your case.
For example, if your remote phone subnet is 18.104.22.168 and your h323 commands are configured under a Loopback0 interface with address 22.214.171.124, please try pinging 126.96.36.199 from the router but have it source it from the loopback address. ie. use the command "ping 188.8.131.52 source lo0".
Also, I believe since you said its a point to point connection, I am guessing you are referring site to site VPN. Please check if RTP inspection is disabled if you have a firewall in the mix. Even though that shouldnt matter since internal calls work fine but worth a try.
Also, once the call is up, you can look at call statistics and see if the received/sent packets are incrementing. If it is, then the phone is receiving packets but not playing out the media. The same statistics can be seen on the gateway using "show call active voice brief:
This means that the call didnt go through the gateway that you are looking but a different gateway. You can go to Device -> Gateway and see if there are other gateways configured and go through each one of them and see if the call hits that gateway. You could also look at CSS/Partitions/Route Patterns/Route List/Route group to see which gateway the call goes through.
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The below trick might come handy when you have to add a new node to a cluster but you don't have or is unsure of the security password for the publisher. This procedure has been around for ages.
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