[Freeswitch-users] Alert-Info and Polycom SIP v4

[Spencer Thomason]

Hello all,
I'm attempting to setup distinctive ring on a few Polycom IP-650/670s running SIP firmware v4.  It seems they want a "non-compliant" Alert-Info header to determine the ring class.  See:

http://community.polycom.com/t5/VoIP/Paging-i-e-auto-answer-not-working-after-upgrade-to-4-x-x/td-p/10394

Is there a way to add a "raw" Alert-Info header?  i.e. without brackets?  I attempted to set the alert_info variable and sip_h_Alert-Info with no luck.  An example of what I'm trying to achieve is:
Alert-Info: info=loud-ring

Thanks,
Spencer