Aastra Telecom SIP 57I - Manual (Page 674)

Advanced Operational Parameters
A-172 41-001160-00, Release 2.1, Rev 04
IP Phone Administrator Guide
Appendix A
Advanced Operational Parameters
The following parameters in this section allow the system administrator to set
advanced operational features on the IP phones.
Blind Transfer Setting
Parameter –
sip cancel after blind transfer Configuration Files aastra.cfg, <mac>.cfg
Description Forces the phone to use the Blind Transfer method available in software
prior to release 1.4. This method sends the CANCEL message after the
REFER message when blind transferring a call.
Format Boolean
Default Value 0 (disabled)
Range 0 (disabled)
1 (enabled)
Example sip cancel after blind transfer: 1