Polycom SIP 2.2.2 manual Take precedence over this feature if enabled. For, Line for the call

Administrator’s Guide SoundPoint IP / SoundStation IP

	Permitted
Attribute	Values	Default	Interpretation
call.offeringTimeOut	positive	60	Time in seconds to allow an incoming call to ring
	integer		before dropping the call, 0=infinite.
			Note: The call diversion, no answer feature will
			take precedence over this feature if enabled. For
			more information, refer to No Answer
			<noanswer/> on page A-91.
call.ringBackTimeOut	positive	60	Time in seconds to allow an outgoing call to
	integer		remain in the ringback state before dropping the
			call, 0=infinite.
call.dialtoneTimeOut	Null, positive	60	Time in seconds to allow the dialtone to be
	integer		played before dropping the call.
			If set to 0, the call is not dropped.
			If set to Null, call dropped after 60 seconds.
call.lastCallReturnString	string of	*69	The string sent to the server when the user
	maximum		selects the “last call return” action.
	length 32
call.callsPerLineKey	1 to 24 OR	24 OR	For the SoundPoint IP 600, 601, and 650, the
	1 to 8	8	permitted range is 1 to 24 and the default is 24.
			For all other phones the permitted range is 1 to 8
			and the default is 8.
			This is the number of calls that may be active or
			on hold per line key on the phone.
			Note that this may be overridden by the
			per-registration attribute of
			reg.x.callsPerLineKey. Refer to Registration
			<reg/> on page A-83.
call.stickyAutoLineSeize	Null, 0, 1	0	If set to 1, makes the phone use "sticky" line
			seize behavior. This will help with features that
			need a second call object to work with. The
			phone will attempt to initiate a new outgoing call
			on the same SIP line that is currently in focus on
			the LCD (this was the behavior in SIP 1.6.5).
			If set to 0 or Null, the feature is disabled (this was
			the behavior in SIP 1.6.6).
			Note: This may fail due to glare issues in which
			case the phone may select a different available
			line for the call.

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