[asterisk-ss7] SS7 echo and OPC fixes

[Matthew Fredrickson]

Daniel Bichara wrote:
> Dear Matthew,
> 
> We detected 2 problems we tried to work around:
> 
> 1) We were getting echo on SS7 calls (no matter the echo-canceler we
> configured). I detected echo canceler was not activated during call setup.
> 
> 2) Connecting same linkset to more than one DPC (different E1s), when
> replying SS7 messages addressed to a CIC associated to one DPC, the
> answer message included wrong PC address.
> 
> Attached my libss7 patches and chan_zap. These patches are running last
> 3 weeks with no problem.
> 
> Please validate them.

First of all, thanks for your hard work in not only finding those issues 
but also finding a fix for them.

Secondly, as Kevin mentioned in another message, please post your patch 
to the bugs.digium.com bug tracker so that it can be evaluated and 
committed.  I can't really use your patch unless it has properly gone 
through that submission process.

-- 
Matthew Fredrickson
Software/Firmware Engineer
Digium, Inc.