Has anyone ever seen Polycom 650 send REGISTER without Authorization even though FS responds with 401?

The weird thing was that it only happened to this particular Polycom phone only.

Please see below:

   ------------------------------------------------------------------------
recv 559 bytes from udp/[67.232.144.163]:10058 at 02:24:22.100024:
   ------------------------------------------------------------------------
   REGISTER sip:199.87.44.19:5060 SIP/2.0
   Via: SIP/2.0/UDP 67.232.144.163:10003;branch=z9hG4bK85aaf1325070992B
   From: "Mark" <sip:7025143416@199.87.44.19>;tag=EED068F-AC7EFF94
   To: <sip:7025143416@199.87.44.19>
   CSeq: 1 REGISTER
   Call-ID: 37fb35c0-279ee281-fd8694be@67.232.144.163
   Contact: <sip:7025143416@67.232.144.163:10003>;methods="INVITE, ACK, BYE, CANCEL, OPTIONS, INFO, MESSAGE, SUBSCRIBE, NOTIFY, PRACK, UPDATE, REFER"
   User-Agent: PolycomSoundPointIP-SPIP_650-UA/3.2.4.0244
   Accept-Language: en
   Max-Forwards: 70
   Expires: 3600
   Content-Length: 0
   
   ------------------------------------------------------------------------
2011-02-01 18:24:28.858417 [WARNING] sofia_reg.c:1247 SIP auth challenge (REGISTER) on sofia profile 'internal' for [7025143416@199.87.44.19] from ip 67.232.144.163
send 676 bytes to udp/[67.232.144.163]:10058 at 02:24:22.174807:
   ------------------------------------------------------------------------
   SIP/2.0 401 Unauthorized
   Via: SIP/2.0/UDP 67.232.144.163:10003;branch=z9hG4bK85aaf1325070992B;rport=10058
   From: "Mark" <sip:7025143416@199.87.44.19>;tag=EED068F-AC7EFF94
   To: <sip:7025143416@199.87.44.19>;tag=5Byyp046mycjS
   Call-ID: 37fb35c0-279ee281-fd8694be@67.232.144.163
   CSeq: 1 REGISTER
   User-Agent: FreeSWITCH-mod_sofia/1.0.head-git-9ffca05 2011-01-26 17-24-25 -0500
   Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, UPDATE, INFO, REGISTER, REFER, NOTIFY, PUBLISH, SUBSCRIBE
   Supported: timer, precondition, path, replaces
   WWW-Authenticate: Digest realm="199.87.44.19", nonce="4b7a72c9-47ad-4d84-b1a1-fe0f68194efd", algorithm=MD5, qop="auth"
   Content-Length: 0
   
   ------------------------------------------------------------------------
recv 559 bytes from udp/[67.232.144.163]:10058 at 02:24:22.628250:
   ------------------------------------------------------------------------
   REGISTER sip:199.87.44.19:5060 SIP/2.0
   Via: SIP/2.0/UDP 67.232.144.163:10003;branch=z9hG4bK85aaf1325070992B
   From: "Mark" <sip:7025143416@199.87.44.19>;tag=EED068F-AC7EFF94
   To: <sip:7025143416@199.87.44.19>
   CSeq: 1 REGISTER
   Call-ID: 37fb35c0-279ee281-fd8694be@67.232.144.163
   Contact: <sip:7025143416@67.232.144.163:10003>;methods="INVITE, ACK, BYE, CANCEL, OPTIONS, INFO, MESSAGE, SUBSCRIBE, NOTIFY, PRACK, UPDATE, REFER"
   User-Agent: PolycomSoundPointIP-SPIP_650-UA/3.2.4.0244
   Accept-Language: en
   Max-Forwards: 70
   Expires: 3600
   Content-Length: 0
   
   ------------------------------------------------------------------------
send 676 bytes to udp/[67.232.144.163]:10058 at 02:24:22.628449:
   ------------------------------------------------------------------------
   SIP/2.0 401 Unauthorized
   Via: SIP/2.0/UDP 67.232.144.163:10003;branch=z9hG4bK85aaf1325070992B;rport=10058
   From: "Mark" <sip:7025143416@199.87.44.19>;tag=EED068F-AC7EFF94
   To: <sip:7025143416@199.87.44.19>;tag=5Byyp046mycjS
   Call-ID: 37fb35c0-279ee281-fd8694be@67.232.144.163
   CSeq: 1 REGISTER
   User-Agent: FreeSWITCH-mod_sofia/1.0.head-git-9ffca05 2011-01-26 17-24-25 -0500
   Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, UPDATE, INFO, REGISTER, REFER, NOTIFY, PUBLISH, SUBSCRIBE
   Supported: timer, precondition, path, replaces
   WWW-Authenticate: Digest realm="199.87.44.19", nonce="4b7a72c9-47ad-4d84-b1a1-fe0f68194efd", algorithm=MD5, qop="auth"
   Content-Length: 0
   
   ------------------------------------------------------------------------
recv 559 bytes from udp/[67.232.144.163]:10058 at 02:24:23.628660:
   ------------------------------------------------------------------------
   REGISTER sip:199.87.44.19:5060 SIP/2.0
   Via: SIP/2.0/UDP 67.232.144.163:10003;branch=z9hG4bK85aaf1325070992B
   From: "Mark" <sip:7025143416@199.87.44.19>;tag=EED068F-AC7EFF94
   To: <sip:7025143416@199.87.44.19>
   CSeq: 1 REGISTER
   Call-ID: 37fb35c0-279ee281-fd8694be@67.232.144.163
   Contact: <sip:7025143416@67.232.144.163:10003>;methods="INVITE, ACK, BYE, CANCEL, OPTIONS, INFO, MESSAGE, SUBSCRIBE, NOTIFY, PRACK, UPDATE, REFER"
   User-Agent: PolycomSoundPointIP-SPIP_650-UA/3.2.4.0244
   Accept-Language: en
   Max-Forwards: 70
   Expires: 3600
   Content-Length: 0
   
   ------------------------------------------------------------------------
send 676 bytes to udp/[67.232.144.163]:10058 at 02:24:23.628895:
   ------------------------------------------------------------------------
   SIP/2.0 401 Unauthorized
   Via: SIP/2.0/UDP 67.232.144.163:10003;branch=z9hG4bK85aaf1325070992B;rport=10058
   From: "Mark" <sip:7025143416@199.87.44.19>;tag=EED068F-AC7EFF94
   To: <sip:7025143416@199.87.44.19>;tag=5Byyp046mycjS
   Call-ID: 37fb35c0-279ee281-fd8694be@67.232.144.163
   CSeq: 1 REGISTER
   User-Agent: FreeSWITCH-mod_sofia/1.0.head-git-9ffca05 2011-01-26 17-24-25 -0500
   Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, UPDATE, INFO, REGISTER, REFER, NOTIFY, PUBLISH, SUBSCRIBE
   Supported: timer, precondition, path, replaces
   WWW-Authenticate: Digest realm="199.87.44.19", nonce="4b7a72c9-47ad-4d84-b1a1-fe0f68194efd", algorithm=MD5, qop="auth"
   Content-Length: 0


Thank you.