Cisco Small Business Pro SPA9000 Administration Manual page 262

SPA9000 Field Reference
Voice tab
SPA9000 Voice System Administration Guide
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XFER Bridge Mode
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Instructs the SPA9000 how to handle call transferring of an
external caller to another external number by a client station.
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
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