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7920 behind 871 strange behavior

I have a 7920 behind an 871 router. The 871 connects in to the main office via EasyVPN to a Cisco ASA. Calls placed on the 871 are very hit and miss. Usually they fail.

The phone registers to CM fine. Also, if I call the outside office number from the 7920, it works EVERY time.

If I dial someone at the office on their extension, it may or may not work. Usually it fails but ocassionally it works.

If I dial an outside number, it may or may not work. Usually it fails.

When calls fail, there are several behaviors we have documented.

Often, if I call an extension, I hear the phone ringing. When the remote party picks up they hear nothing but I continue to hear the phone ring. Eventually the ringing stops at it just goes silent. Perhaps VM is picking up. Either way, the call basically drops.

If I make a call to the outside, the remote party hears their phone ring exactly one time. They don't have time to pick up the call. As above, I hear the phone continue to ring. Eventually, as described above, the call drops.

Again, I can call our main office number and the call is successful every time. Additionally, I can dial an extension after dialing the main # and that works every time.

Basically, unless I call the main # and route my call through there, I have a 7920 that is unusable. I have been struggling with this one. I know there are many many variables to consider and I can provide as much of that as needed.

Is there any hope? Thanks!

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Re: 7920 behind 871 strange behavior

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