[asterisk-users] How to MessageSend to a SIP from AMI Or CLI?

[Face]

Hello all,

I am running Asterisk 10.10.0 and I can send Message between SIP's no
problem. However, I would like to be able to send send Message to a
SIP from  AMI Or CLI.  I check the ListCommands On the AMI and it
don't have MessageSend. Therefore, I try the SendText.

AMI:
Action: SendText"
Channel: SIP/600"
Body: This is a test.
Message: This is a test.
Extension: 600";


Response: Error
Message: No such channel

Any help would be much appreciated.

-- 
Sincerely,