asterisk users - Apr 2006 - MoH issue

Hey everyone,

Hopefully I can describe the problem well enough so bear with me.

There are 3 companies that are tied into our asterisk server. Company A 
(us) uses the default settings for music on hold. Companies B and C 
however, want something different. For them I have when a call comes 
into their dial plan it sets the music on hold to their music and that 
seems to work. However, here is the problem. Calling out, it still plays 
the old on hold music.

Here is the situation, the 3 companies if they call each other us SIP 
and don't even touch the PRI, only outgoing calls outside the companies 
will do that. So I also would like if B called C, C's music on hold 
would be the one heard.

Here is how I started the dialplan.
[Empire-Outbound]
exten => _.,1,Answer()
exten => _.,n,SetMusicOnHold(OrigMusic)
exten => _.,n,Wait(2)
exten => _.,n,Goto(Empire-Outbound2,${EXTEN},1)

[Empire-Outbound2]
include => A-DirectDial                         ;Direct Dial Context
include => Empire-VoiceMail                     ;Voicemail context
include => Empire-Wildcard                      ;Basic calling function


Does switch between contexts reset the moh? Or can I not change the moh 
for SIP channels and only on Zap?

Thanks,
Kevin