Cisco Linksys SPA9000 - Manual (Page 205)

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Linksys SPA9000 Administrator Guide
Document Version 3.01
Chapter 6 SPA9000 Field Reference
Line 1/2/3/4 Tab
XFER Bridge Mode Instructs the SPA9000 how to handle call transferring of an external caller to another
external number by a client station. This parameter was added in Release 5.1.
The normal way of performing this operation is for the SPA9000 to send a SIP REFER
method to the calling device to let it contact the transfer target directly. The SPA9000 then
drops out of the call completely. This requires the calling device (the transferee) and the
target device to understand the SIP signaling involved and the operation permitted by the
underlying service providers. Note that the call legs with transferee and the transfer target
might be with different ITSP. The SPA400, for instance, cannot handle this operation.
With bridging, the SPA9000 maintains two separate call legs throughout the call: one with
the transferred call and one with the transfer target. The two call peers connect only with
the SPA9000, while the SPA9000 acts as a proxy for the RTP packets exchanged between
the two parties.
This parameter has three possible values:
• none —Do not bridge call transfer (use the normal REFER method)
• all —Bridge all call transfer
• all except same line—Bridge call transfer only if it is between 2 different Line
interfaces
Field Description