CP-6871 MPP phone and SIP REFER

[mrspock]

Hi,
We have a CP-6871 Multiplatform phone on which we defined the softkey PSK 1 as:
 fnc=sd;ext=1234@150.20.30.40;vid=1;nme=Test

PSK1 is available when the phone is connected (while on the call). When the user clicks that key, a SIP REFER should be sent to the ext above, but 6871 doesn't do that.

We also use SPA508g phones, and they have the same settings as the CP-6871 as far as we can tell, and they send the SIP REFER.

Any settings we can change to get the CP-6871 send the SIP REFER?

Thanks.

[mrspock]

Some more information:

We noticed that CP-6871 sends an out-of-dialof SIP INVITE instead of a in-dialog REFER although the phone is already connected.

Any ideas how to force it to send REFER? 

Thanks.

[TechLvr]

Does the Allow header on the incoming SIP invite contain the REFER option? 

[mrspock]

Yes it does.

Allow: ACK, BYE, CANCEL, INFO, INVITE, NOTIFY, OPTIONS, REFER, UPDATE

The older SPA508G phones send the REFER to the same server.

Thanks