As we all know, in ISDN you can detect when you go to a voicemailbox of
a cellular line by looking for the PROGRES message as defined in Q.931.


Can somebody please explain to me how this is message is handled in SIP
? 

 

Thanks, Johan. 

 

 

 


Johan De Clercq 


j.decle...@vocalcom.be 
Tel  : +32 (0)2 467 82 01 
Fax : +32 (0)2 467 82 10 
Av. Reine Astrid / Koningin Astridlaan 59 
B - 1780 Wemmel 

  <http://www.vocalcom.com> 

 

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