[asterisk-users] SIP Headers

[Dan Journo]

Hi,

 

I was wondering where I can find a list of SIP Headers which can be used
for the SPA 921 to customise the ringtone and other features for each
call.

 

Here is an example taken from
http://www.voip-info.org/wiki/view/Asterisk+cmd+Page

 

exten => s,3,SIPAddHeader(answer-after=0)

 

Many thanks

Dan Journo

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