Polycom SIP 2.2.0 manual Parameter if set to 1 when the parameter, To 1 default is

Administrator’s Guide SoundPoint IP / SoundStation IP

SIP <SIP/>

This configuration attribute is defined as follows:

	Permitted
Attribute	Values	Default	Interpretation
voIpProt.SIP.useContactInReferTo	0, 1	0	If set to 0, the “To URI” is used in the REFER.
			If set to 1, the “Contact URI” is used in the
			REFER.
voIpProt.SIP.useRFC2543hold	0, 1	0	If set to 1, use the obsolete c=0.0.0.0
			RFC2543 technique, otherwise, use SDP
			media direction attributes (such as
			a=sendonly) per RFC 3264 when initiating
			hold. In either case, the phone processes
			incoming hold signaling in either format.
voIpProt.SIP.useSendonlyHold	0, 1	1	If set to 1, the phone will send a reinvite with
			a stream mode attribute of “sendonly” when a
			call is put on hold. This is the same as the
			previous behavior.
			If set to 0, the phone will send a reinvite with
			a stream mode attribute of “inactive” when a
			call is put on hold.
			NOTE: The phone will ignore the value of this
			parameter if set to 1 when the parameter
			voIpProt.SIP.useRFC2543hold is also set
			to 1 (default is 0).
voIpProt.SIP.lcs	0, 1	0	If set to 1, the proprietary “epid” parameter is
			added to the From field of all requests to
			support Microsoft Live Communications
			Server.
voIpProt.SIP.ms-forking	0, 1	0	If set to 0, support for MS-forking is disabled.
			If set to 1, support for MS-forking is enabled
			and the phone will reject all Instant Message
			INVITEs. This parameter is relevant for
			Microsoft Live Communications Server
			server installations.
			Note that if any end point registered to the
			same account has MS-forking disabled, all
			other end points default back to non-forking
			mode. Windows Messenger does not use
			MS-forking so be aware of this behavior if
			one of the end points is Windows Messenger.
voIpProt.SIP.dialog.usePvalue	0, 1	0	If set to 0, phone uses "pval" field name in
			Dialog. This obeys the
			draft-ietf-sipping-dialog-package-06.txt draft.
			If set to 1, phone uses a field name of
			"pvalue".

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