This object specifies the scope of packets to
which the source IP address of the interface
designated by cSipCfgBindSrcAddrInterface
will be bound. A value of 'all' means the IP address
will be bound to both SIP signalling and media packets.
A value of 'control' means the IP address will only
be bound to SIP signalling packets.
If cSipCfgBindSrcAddrInterface is set to 0,
the value of this object has no meaning.