Musiconhold does not work corectly

Hello we have a class “default” and a class “test1” in our musiconhold.conf
If I dial from a sip device I will heare “test1” => this is corect
If I dial over a miSDN channel I will here “default” => this is not corect

lenny*CLI>
    -- mISDN/2-u20 answered SIP/908-ab128c50
    -- User entered '2103'
    -- Executing [602@fromsip:4] Macro("mISDN/1-u21", "jumpintern|2103") in new stack
    -- Executing [s@macro-jumpintern:1] Set("mISDN/1-u21", "troption=t") in new stack
[Jan 25 15:40:54] DEBUG[514]: app_macro.c:337 _macro_exec: Executed application: Set
    -- Executing [s@macro-jumpintern:2] Goto("mISDN/1-u21", "fromsip|2103|1") in new stack
    -- Goto (fromsip,2103,1)
[Jan 25 15:40:54] DEBUG[514]: app_macro.c:337 _macro_exec: Executed application: Goto
  == Channel 'mISDN/1-u21' jumping out of macro 'jumpintern'
    -- Executing [2103@fromsip:1] Answer("mISDN/1-u21", "") in new stack
    -- Executing [2103@fromsip:2] MusicOnHold("mISDN/1-u21", "test1") in new stack
    -- Started music on hold, class 'default', on mISDN/1-u21
[Jan 25 15:40:58] NOTICE[499]: rtp.c:787 process_rfc3389: Comfort noise support incomplete in Asterisk (RFC 3389). Please turn off on client if possible. Client IP: 192.168.3.25
    -- Stopped music on hold on mISDN/1-u21
  == Spawn extension (fromsip, 2103, 2) exited non-zero on 'mISDN/1-u21'
    -- Executing [h@fromsip:1] Hangup("mISDN/1-u21", "") in new stack
  == Spawn extension (fromsip, h, 1) exited non-zero on 'mISDN/1-u21'
[Jan 25 15:41:14] DEBUG[514]: chan_misdn.c:2425 misdn_hangup: misdn_hangup(mISDN/1-u21)
    -- Executing [2103@fromsip:1] Answer("SIP/746-ab12c2d0", "") in new stack
    -- Executing [2103@fromsip:2] MusicOnHold("SIP/746-ab12c2d0", "test1") in new stack
    -- Started music on hold, class 'test1', on channel 'SIP/746-ab12c2d0'
    -- Stopped music on hold on SIP/746-ab12c2d0
  == Spawn extension (fromsip, 2103, 2) exited non-zero on 'SIP/746-ab12c2d0'
    -- Executing [h@fromsip:1] Hangup("SIP/746-ab12c2d0", "") in new stack
  == Spawn extension (fromsip, h, 1) exited non-zero on 'SIP/746-ab12c2d0'

What can we do?