[asterisk-users] Return SIP 401 on hangup

Bryant Zimmerman BryantZ at zktech.com
Wed Jan 21 08:24:20 CST 2015

I am having and issue I hope someone can help with..
 I have calls that often come in that need to be blocked. We wish to do 
this without answering the call.
 The issue is our carriers have fail over servers and will try sending the 
call from each when we block the call.
 If we send a hangup with a Sip 401 they will stop the route advance on 
their end.
 The issues is we have been sending a hangup/cause code 21 (Call rejected)
  But they are receiving a 403 Forbidden..
 Is there any hangup code that we can send that will reply a 401.. We see 
the 401 on the inbound is converted to a cause code 21 but we do not see 
any cause codes listed to send a 401 out. Please advise as this a becoming 
an issue for us as we have multiple vendors expecting a 401 not a 403
 Any assistance is appreciated. 
 Thank you.

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