[Asterisk-Users] SIP & ALERT_INFO for distinctive ring

[Kubat, Philip]

Does anyone have SIP distinctive rings working with SIP providers, inbound? 
BroadVoice allows for several numbers on a single account, which they
delivered with distinctive ring over the primary number.  All the calls come
in with the sip header “from” as the primary number.  It looks like (via sip
debug and ethereal) that the SIP header variable “ALERT_INFO” is set to a
ringer type.  (I believe this is part of the RFC)

>From what I can figure Asterisk supports setting “ALERT_INFO” for sending
calls to SIP devices. 

My question is can I read it for inbound calls?
Other ideas?

Thanks,
Philip