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Jabber call to voice mail fails with fast busy over VPN

Update:10-11Source: network consolidation
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I have an issue that I ran into with CIPC phones over a VPN.  If a CIPC phone called over a VPN and started ringing a phone the call would fail with fast busy at the time the call would be forwarded to voicemail.  I found the issue was when remote the CIPC phone would negotiate the g.729 codec, when forwarded to a voicemail pilot over a SIP trunk set to g.711 the call would fail due to codec missmatch when no transcoders are present.
So now I am running into what I believe to be the same issue with Jabber, when on premise the calls to voice mail work just fine, but when remote they fail.  I can directly call the voicemail pilot without error, but if calling a phone the call gets fast busy at the point we are forwarded to voicemail.  Even though all my regions are set to talk to all other regions on G.711 and the voicemail SIP trunk is set to G.711, I believe with the new features in CUCM9 that a lower speed codec has been negotiated since the we are going over the VPN, or Jabber has done this as it knows it's over VPN (not sure).  WIth CIPC I could go into the settings and turn off the Optimize for Bandwidth check box and the call would negotiate G.711.  With Jabber I can't find anything that would tell my Jabber client to stay on G.711 and I can only imagine this is a codec missmatch as the following are true.
1. CIPC and Jabber share the same line
2. VPN established and CIPC optimised for low bandwidth un-checked
3. Over the same VPN the CIPC phone can leave a voicemail
4. Over the same VPN the Jabber client gets fast busy once forwarded to voicemail
5. Voicemail environment is Exchange-UM over SIP trunk
6. SIP trunk is assigned a Device Pool, that is assigned to a region that all other regions communicate G.711 to
7. On CIPC if optimised for low bandwidth is checked I get the exact same issue as I get with the Jabber client (fast busy when forwarded to voicemail)
Would anyone know what I can do in CUCM 9 to fix this issue, as said no issue when all devices are on premise.  Wondering if there is a service parameter or a way to change the codec selection so the Jabber client attempts to always negotiate G.711.  The correct answer would be to get some PVDM DSP resources and kick up a transcoder in my resource group, and that may be what I talk them into doing if I have no other options.                  

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We have been getting the exact same thing for almost a year now... since switching to FiOS Digital Voice in May of last year!  Every time I call in to report it they 'escalate' the issue but it never gets resolved.  The problem seems to be in the initial connection.  Most of the time it works fine but, several times a month, after I call to get messages and it starts to play the new message it goes dead and I get the busy signal.  I get the same message when I call back:  “I’m sorry – that account is in use at this time.  Please try again later!”  I have even called in with my cell phone and get the same message!  I HAVE EVEN used the Internet to see if I could get my messages and, when I hit Play, I get a pop-up saying: “Your Voice Mail box is currently in being accessed; please try again later.  If the problem continues, please contact our Customer Support Center at 1-888-553-1555. We apologize for any inconvenience.”  This is obviously a software bug that Verizon has no clue on how to troubleshoot OR fix!!!  I wonder how many people have the problem and just don’t bother reporting it because of the hassle?  When it first started happening they destroyed my entire mailbox and I had to re-enter the complete mailbox setup again – 3 times!!!  NEVER let them talk you into that!!!  It’s their problem and they need to fix it!!!!!!!  I wish I could go back to the ‘normal’ voicemail we originally had… they want hundred$ to switch back because I’d be breaking my #[email protected]%^&* contract!  Good luck if you have Verizon………