Remote Cisco IP phone can't make a call outside the office or receive calls from outside the office

DId you check if the calls made from outside the office are hitting your switch? I think no, and this could be a network problem.
Please let me know.

michofreiha - The calls are hitting the switch, perhaps I misunderstood your post? :-)  The remote users 7900 series phones are registered to the CM at the corp office.  They can call corp office users from the remote registered phone and corp office users can call the remote users, and all is perfect.  The issue is when an outside users attempts to call the remote user through the CM or when the remote user attempts to call outside the corp office.  When the remote user receives a call from an outside user, the caller can hear the remote user but the remote user can't hear the caller.  When the remote user places a call to an outside user, the called party can hear the remote user but the remote user can't hear the called party.  

bfason - I did notice the CM on had one region and one device pool setup.  The region was using G.711.  I created a new "remote" region and "remote" device pool.  I then changed the codec to G.729 and added the remote users to the device pool.  I have asked the users to test the phones tomorrow and adivse...

I will update tomorrow....any other thougts or ideas?

Thanks.

Only other thing that comes to mind is on the gateway router that connects to the telco is the command

voice rtp send-recv

this lets it establish 2 way voice without waiting for a connect acknowledgement.

Hope this helps
B

Well...the call quality has improved and the remote user can place outbound calls and the called party can hear them, but the remote use still can't hear the called party on a call they originate.  When a call is routed to them from an outside party, the outside party can still hear the remote user, but the remote user can't hear the caller !@#$  I must be doing something simple incorrectly.  

As I mentioned, I'm relatively new to the call manager solution so it could be a simple config issue that i have overlooked...
It's just strange that all voice traffic outside the office can't talk to the remote users, but can hear the remote users.  

It's not a configuration issue, I think it's a codec issue, please be sure that both parties are using the same codec from both side

Do you have a dsp farm set up for codec translation and mtp?

I don't believe a dsp farm has been setup...isn't that primarily for conference calling bridges across WAN connections?? the gear on both ends uses SCCP to communicate and register with the remote site CM...?  These a just individual users that require basic phone service....but i'm new to the call manager system...