FYI :
here is a list of the SIP TIE-LINE SERVICES supported by MX-ONE :
The following services make use of standard SIP signaling (according to RFCs):
• Call Deflection/Single Step Transfer
• Call Diversion
• Called Party Number
• Calling/Connected Line Identity
• Calling/Connected Line Identity Restriction
• Calling/Connected Name Identity
• DTMF signaling (according to RFC 4733 and also with INFO, and in-band on G.711)
• Night Service Diversion
• Rerouting
• Transfer/Extending (both REFER and disconnect methods)
• Type of Party (Alert information, ring signal information)
The following services make use of proprietary SIP-based signaling:
• Bypass of Call Diversion/Deflect/DND
• Customer Identity