This is an intermittment issue. A call is placed on Hold, the other party does hear MOH. The Resume soft button does appear, however, nothing happens when Resume is pressed.
SIP traces and SIP debug logs from the phone show that the phone does not send the INVITE to resume the call.
voIpProt.SIP.useRFC2543hold = "0"
voIpProt.SIP.useSendonlyHold = "1"
Any assistance is greatly appreciated!
welcome to the Polycom Community.
I would suggest to at least upgrade to SIP 3.2.7 before you do any more testing.
Please ensure to provide some feedback if this reply has helped you so other users can profit from your experience.
Polycom Global Services
the next step is to raise a support ticket vie your Polycom reseller or wait for a community partner to assist you further here.