[asterisk-users] SIP problem - ACT p160s error

[joe, at j4computers (joea at j4computers.com)]

I have a setup with a polycom 601 and an act p160s.  All on local segment, no NAT.  

Can call the act p160s, from the polycom, rings, connects, and a conversation can take place.  The reverse is not true, Dialing from the act to the polycom does not work.  SIP debug shows, at the end, "Incoming call: got sip response 416 "unsupported URI Scheme" back from 192.168.0.xxx.  Which is the act phone, the orginator.

One presumes this is a configuration issue with the Act phone.  Any clues?   Such as what a proper config for this phone should look like?  Act support has made an initial response, but there is a big time lag them being on the other side of the earth.

joe a.