Has anyone successfully implemented paging (auto-answer) with a polycom phone?

I am using the Conferencing and Intercom sample which sets the sip_auto_answer variable to true, however on my polycom phone the result is that the phone rings once and hangs up right away (the phone is sending a BYE message). I tried adding an Alert-Info header, however it seems that the Polycom format (Alert-Info: Ring Answer) isn't compliant with the RFC and I couldn't get freeswitch to send the header in this format. 

 

Has anyone else been able to either get polycom phones to work with sip_auto_answer or to get freeswitch to send an Alert-Info header in the polycom format?

 

Thanks,

Duvid Rottenberg