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One way video need assistance

We have a network that carries audio/video. We recently moved T1 which results in one way video. site A can ping B, B can ping A. Previosly A had the T1 connection which got moved to C which connects A. With the move, A can see video at B, but B can't see A. Both A & B serial interface are configed as :
fair-queue 1024 1024 11
 ip rtp header-compression
 ip rtp compression-connections 25
 ip rtp priority 16384 16383 240

C's serial interface for T1 is not config'ed as above. Could this is be reason?
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2 Solutions
If you are using header compression at one site and not the other, then yes, you can have issues. Make them the same.
Also check routing from A and B to C and back
totaramAuthor Commented:
Thanks lrmoor..
I checked the pings to each other (A,B & C) and they seem fine. I believe it should be ok for connectivity, right?? Can one have no compression on both ends of T1? I believe that both ends have to have rtp, as packets are taking several routes while flowing. Also, the router IOS 12.1(5) for C. Can that be the problem??
Both ends of a T1 need to match. compression or no, same on both.

>as packets are taking several routes while flowing
You're going to have to explain this one. Is there more than one path from one site to the other?

The particlular router version can always be a problem, depending on the exact version and whether or not there are bugs in that version and if those bugs affect what you are trying to accomplish.
They do not have to match end-to-end at all, but if you have features enabled on one end that are not available in the other end, then you have to compromise somewhere.
totaramAuthor Commented:
Thanks lrmoor, Yes there are multiple paths.

I will look into the IOS versioning for A/V support.

On a different note:
The way the network was originally setup :
A<----T1 Line-------->B and worked very well (A&B are polycom terminals) now it's being modified as:
A<-----T1 Line--------->C <--VLANS,routers on Local fiber-->B
Polycoms remains at A&B. Do polycom and Serial interfaces have to terminate on same router??
totaramAuthor Commented:
Change both ends @ router to switch port to 100 mb full.
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