How to Send 10 Digits in a single HTTP PUSH request in SP IP phone

Hi,

I want to send a 10 digit number as a HTTP PUSH to Polycom SP IP phone. Where as If I use

"Key:DialPad8\nKey:DialPad2\nKey:DialPad3\nKey:DialPad2\nKey:DialPad7\nKey:DialPad2\nKey:DialPad9\nKey:DialPad1\nKey:DialPad6\n" 

 the PUSH is not happening. If I send a single

"Key:DialPad8"

 the HTTP push is happening succesfully. Is there any way to send all 10 digits in a single http PUSH?

Thanks,

Pradeep