I am using a SIP softphone (X-lite, SIPPS or Firefly) connected to an Asterisk v 1.0.3 PBX.  The PBX is also connected via a ISDN-PRI crossover cable to a Avaya Definity Generic 3 PBX via a TE405P card.  All outside of the office calls go through the Definity.  Here's the issue:
 
Calls to internal SIP extensions, Definity extensions, other offices within our private network (through the Definity), and cell phones are great.  When I call outside of the office to POTS lines (like my home), there is a most noticeable echo of my voice.  The party on the line hears no echo.  Any efforts on the configuring the SIP softphones, and within zapata.conf, have been for naught.
 
Is this problem common for ISDN-PRI connections?



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