asterisk users - Nov 2006 - Handy tip for intercom with FreePBX & Grandstream phones

We use intercom 100% inter-office.  To get FreePBX to do this with
Grandstreams by default without having to create intercom or paging
groups, just change the following line (line #58) in your
extensions.conf from:
 
exten => s,10,Dial(${ds})                               ; dialparties
will set the priority to 10 if $ds is not null

to:
 
exten => s,10,SIPAddHeader(Call-Info: answer-after=0) ;dialparties will
set the priority to 10 if $ds is not null
exten => s,11,Dial(${ds})                               
 
Hope this helps someone in the future.
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