[Asterisk-Users] Channel Variable

[Assaf Benharoosh]

Hi all,
Does anyone know how to get the channel ID on the other side of the
call? 
For example: When SIP/50 calls SIP/21, and the call is answered by
SIP/21 I get:
 
SIP/21-6735 answered SIP/50-b456
 
${CHANNEL} will show me SIP/50-b456. 
Is there a parameter or a workaround to get the SIP/21-6735 part?
 
Thanks.
Assaf Benharoosh

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