BC127, Answer Skype Call on Android devices

Hi.
We have the problem that we could not answer or end a Skype call on a Android device with our BC127 BT-Module.

The BC127 Module is connected to a Android Smartphone where the Skype App is running.
When I get an incoming Skype call I get the following informations from the module back:

AT 13 10 +CIEV: 2,2<\r>
CALL_OUTGOING 13<\r>
SCO_OPEN 13<\r>
AT 13 10 +CIEV: 2,3<\r>
AT 13 10 +CIEV: 1,1<\r>
CALL_ACTIVE 13<\r>
AT 13 10 +CIEV: 2,0<\r>

Then I was trying to answer the call with the “MUSIC 11 PLAY” command:
→ send MUSIC 11 PLAY
OK<\r> //first try to answer call
→ send MUSIC 11 PLAY
OK<\r> //second try to answer call

The module will response “OK” but the call will not be answered.
When the call will be closed I get the following informations back:

SCO_CLOSE 13<\r>
AT 13 10 +CIEV: 1,0<\r>
CALL_END 13<\r>
A2DP_STREAM_START 10<\r>
A2DP_STREAM_SUSPEND 10<\r>

When I try to answer the call with the “CALL 13 ANSWER” command I get the error “ERROR 0x0013” back from the module.
On iOS devices this command will work and the Skype call could be answered and ended.

Does anybody know how I can answer a Skype call on Android devices?