Polycom SIP 3.1 - Manual (Page 164)

Administrator’s Guide SoundPoint IP / SoundStation IP
A - 10
SIP
This configuration attribute is defined as follows:
Attribute
Permitted
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".