[Asterisk-Users] SIP called number on incoming call

[bladerunner]

hi people on list,

i have a rather tough problem:

incoming sip from my ISP no problem, he gives me a sip trunk that i connect to 
asterisk.

register => ${username}:${password}@voip.${isp}.at/12345

so when an incoming call arrives it is sent to extension 12345. from there on 
it should be processed, extracting the DID-digits from the sip header or from 
some other source.

what would be the best method to get those DID-digits (i was not able to find 
them in the global variables provided by asterisk, but i know for sure my isp 
sends them somewhere in the sip packets)?

kind regards,

michael
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