Avaya 5610SW IP Unregisters from IP Office 500

I recently started working remotely and decided to go the VoIP route to make my being physically out of the office a bit more transparent. I'm no expert on the matter and I'm sure their are simpler implementations but this is what I have to work with so here we go.

My main office has an Avaya IP Office 500 unit running v4.0 (10) that handles the in-office phone service. This has been working without issue for years now. We have a manager server that runs the supporting applications for IP Office.

Here at my remote office I have a fairly reliable DSL connection and a Netgear FVS318 VPN router. I have a site-to-site tunnel setup from here to an Linksys RV042 at the main office. The tunnel has been very reliable so far. Average round trip ping between the networks is in the low 30ms and no apparent packet loss.

I have an 5610SW IP phone connected to the FVS318 router here in my remote office. It is setup and pointed at the IP Office system over the VPN. I have the initial setup completed. The phone has an extension, user and incoming call route associated with it. I can receive and place calls from the phone reliably and the audio quality is pretty good. Not a lot of echo, drop out or other issues, at least with phone calls.

However, when I attempt to retrieve Voicemail using the phone LCD menu system I run into issues. I can enter the on-screen voicemail menu and retrieve messages and listen to them successfully, but when I attempt to interact with the messages in my voicemail, be it deleting them, saving them or rewinding them etc., the phone locks up and is stuck in the voicemail menu system. The only way to get out of the voicemail menu and back to the main call screen is to reboot the phone. In addition, the phone will occasionally reboot on its own, usually not during a call, but while attempting to use other menu functions, hold, transfer, etc.

I've looked at the system monitor while performing these function in the voicemail menu on the phone. Below is the output. It appears as though as soon as I press the button on the phone for the menu function the phone is un-registering. Any ideas what the issue may be? I'd really like to get this working if possible. Thanks for your time.

 149290299mS CMExtnTx: v=5634, p1=0
            CMVoiceMailMsg
            Line: type=IPLine 250 Call: lid=252 id=1635 in=0
            Called[MsgPlaying] Type=Default (100) Reason=CMDRdirect  Called SubAddress[2009/8/21 12:22] Calling[98172992800] Type=Default Plan=Unknown Calling SubAddress[38]
            Display [TX APPLIANCE&BU>Russ Gould]
            Tag type=Text [MSG00011.] [0x4d 0x53 0x47 0x30 0x30 0x30 0x31 0x31 0x00 ]
            Timed: 21/08/09 15:37
 149290343mS H323Evt: v=0 stacknum=250  State, new=NullState, old=Active id=394
 149290343mS H323Evt:    GK: Unregister endpoint HOUDATAFLOW_4a8ebdf623d05418 for extension 5634
 149290344mS CMLOGGING:     CALL:2009/08/2115:36,00:01:10,000,5634,O,?RussGould,?RussGould,RussGould,,,1,,""n/a,0
 149290345mS CD: CALL: 252.1635.0 State=2 Cut=2 Music=0.0 Aend="RussGould(5634)" (0.0) Bend="?RussGould(Voicemail)" [VoiceMail] (21.41) CalledNum=?RussGould () CallingNum=5634 (RussGould) Internal=1 Time=70747 AState=0
 149290345mS CD: CALL: 252.1635.0 Deleted
 149290346mS CMExtnTx: v=RAS, p1=0
            CMReleaseComp
            Line: type=RAS 1 Call: lid=0 id=1009 in=0
            BChan: slot=21 chan=41
            Cause=130,
 149290346mS CMMap: a=21.41 b=0.0 T0
 149290347mS CMExtnTx: v=RAS, p1=0
            CMReleaseComp
            Line: type=RAS 1 Call: lid=0 id=1009 in=0
            BChan: slot=21 chan=41
            Cause=130,
 149290349mS CMExtnTx: v=5634, p1=8001
            CMReleaseComp
            Line: type=IPLine 250 Call: lid=252 id=394 in=1
            Cause=16, Normal call clearing
 149290349mS CMLineTx: v=250
            CMReleaseComp
            Line: type=IPLine 250 Call: lid=252 id=394 in=1
            Cause=16, Normal call clearing
 149290351mS CMMap: PCG::UnmapBChan pcp[42]b1r0 cp_b f5ad8b5a other_cp_b f5ade212
 149290351mS CMMap: a=4.1 b=21.41 M0
 149290351mS CMMap: PCG::UnmapBChan pcp[174]b0r1 cp_b 0 other_cp_b 0
 149290352mS CMMap: a=4.1 b=0.0 Mapper::FreeCodec freed CMRTVocoder resource busy 1, total 4
 149290404mS RES: Fri 21/8/2009 15:37:14 FreeMem=80071424(39) CMMsg=6 (6) Buff=200 976 1000 7160 5 Links=20348
 149313861mS H323Evt:    Recv: RegistrationRequest c0a8900a; Endpoints registered: 0; Endpoints in registration: 0
 149313861mS H323Evt:    RRQ --- keep-alive rejected (endpoint is currently not registered)
 149313914mS H323Evt:    Recv GRQ from c0a8900a
 149313969mS H323Evt:    Recv: RegistrationRequest c0a8900a; Endpoints registered: 0; Endpoints in registration: 0
 149313969mS H323Evt:    RRQ --- CallSigProtocol is H323AnnexL_P. Go for IP4600
 149313969mS H323Evt:    RRQ --- Register extn 5634 using product IP_Phone, version 2.300
 149313970mS PRN: NO PIPE!!!
 149314404mS RES: Fri 21/8/2009 15:37:38 FreeMem=80068820(38) CMMsg=6 (6) Buff=200 976 1000 7160 5 Links=20345
 149315322mS H323Evt:    Recv GRQ from c0a8900a
 149315373mS H323Evt:    Recv: RegistrationRequest c0a8900a; Endpoints registered: 0; Endpoints in registration: 1
 149315374mS H323Evt:    RRQ --- CallSigProtocol is H323AnnexL_P. Go for IP4600
 149315374mS H323Evt:    RRQ --- Treat this as a forced login, the phone was probably rebooted (same_cs_addr 0)
 149315374mS H323Evt:    GK: Unregister endpoint HOUDATAFLOW_4a8ebf4140a266f1 for extension 5634
 149315374mS PRN: NO PIPE!!!
 149315375mS H323Evt:    GK: Send URQ
 149315375mS H323Evt:    RRQ --- Register extn 5634 using product IP_Phone, version 2.300
 149315375mS PRN: NO PIPE!!!
 149371006mS H323Evt:    Recv: RegistrationRequest c0a8900a; Endpoints registered: 0; Endpoints in registration: 1
 149388016mS H323Evt:    GK: Unregister endpoint HOUDATAFLOW_4a8ebf4317ff2fe4 for extension 5634
 149388016mS PRN: NO PIPE!!!
 149388316mS H323Evt:    Recv GRQ from c0a8900a
 149388370mS H323Evt:    Recv: RegistrationRequest c0a8900a; Endpoints registered: 0; Endpoints in registration: 0
 149388370mS H323Evt:    RRQ --- CallSigProtocol is H323AnnexL_P. Go for IP4600
 149388370mS H323Evt:    RRQ --- Register extn 5634 using product IP_Phone, version 2.300
 149388370mS PRN: NO PIPE!!!