asterisk users - Oct 2005 - IAX2 calls dropped (Max retries)

Hi all,
      An IAX2 question...
Working on two Asterisk machines using beta1.
Lets say A and B

A => B (using IAX2 drops call)
It prints warning message of Max retries exceeded .

B => A (works fine as it should)

I searched the archives and got similar question which is unanswered.

Surely it cannot be network problem because it is going one way.

Can it be with port 4569 on outgoing channels of one machine.

Any help any idea....................:)


/Gurmi