Possible problems:
- SIP/2.0 415 Unsupported Media Type
This problem can occur when you have the SatSite/LabKit in working modes like: GSM roaming or GSM dataroam and is connected to a Core Network.
To solve this :
Log in to Local Management Interface (LMI) and uncheck “Text sms” from BTS Configuration -> Core -> Roaming -> Text sms