Polycom Spectralink 8002, User Agent not matched

[sixteamparlay]

running 3CX 8.0.10116.583 and receiving assert errors on the Polycom Spectralink 8002 phones all the time. Below is a 3cx log of a phone call from one of the spectralinks. What does User Agent not matched mean?

Thank you!

16:57:02.867 [CM503008]: Call(6): Call is terminated
16:56:38.509 [CM503007]: Call(6): Device joined: sip:[email protected]:5066
16:56:38.509 [CM503007]: Call(6): Device joined: sip:[email protected]:5060
16:56:32.632 [CM503002]: Call(6): Alerting sip:[email protected]:5066
16:56:32.288 [CM503025]: Call(6): Calling Unknown:7556@(Ln.10000@PSTNGATEWAY)@[Dev:sip:[email protected]:5066]
16:56:32.241 [CM503004]: Call(6): Route 1: Unknown:7556@(Ln.10000@PSTNGATEWAY)@[Dev:sip:[email protected]:5066]
16:56:32.241 [CM503010]: Making route(s) to <sip:[email protected]>
16:56:32.241 [CM505001]: Ext.7730: Device info: Device Not Identified: User Agent not matched; Capabilities:[reinvite, replaces, able-no-sdp, recvonly] UserAgent: [Slnk/12] PBX contact: [sip:[email protected]:5060]
16:56:32.241 [CM503001]: Call(6): Incoming call from Ext.7730 to <sip:[email protected]>
16:54:25.186 [CM503008]: Call(5): Call is terminated
16:54:12.025 [CM505001]: Ext.7730: Device info: Device Not Identified: User Agent not matched; Capabilities:[reinvite, replaces, able-no-sdp, recvonly] UserAgent: [Slnk/12] PBX contact: [sip:[email protected]:5060]
16:54:12.025 [CM503002]: Call(5): Alerting sip:[email protected]:5060
16:54:10.227 [CM503025]: Call(5): Calling Ext:Ext.7730@[Dev:sip:[email protected]:5060]
16:54:10.164 [CM503004]: Call(5): Route 1: Ext:Ext.7730@[Dev:sip:[email protected]:5060]
16:54:10.164 [CM503010]: Making route(s) to <sip:[email protected]>