Polycom SIP 3.1 - Manual (Page 163)

Configuration Files
A - 9
SDP
This configuration attribute is defined as follows:
voIpProt.server.x.retryMaxCount Null or
non-negativ
e integer 3 If set to 0 or Null, 3 is used. retryMaxCount
retries will be attempted before moving on to
the next available server.
voIpProt.server.x.expires.lineSeize positive
integer,
minimum 10 30 Requested line-seize subscription period.
voIpProt.server.x.lcs 0, 1 0 This attribute overrides the
voIpProt.SIP.lcs
.
If set to 1, the proprietary “epid” parameter is
added to the From field of all requests to
support Microsoft Live Communications
Server.
Attribute
Permitted
Values
Default Interpretation
Attribute
Permitted
Values
Default Interpretation
voIpProt.SDP.
useLegacyPayloadNegotiation
0, 1 Null If set to 1, the phone transmits and receives
RTP using the payload type identified by the
first codec listed in the SDP of the codec
negotiation answer.
If set to 0 or Null, RFC 3264 is followed for
transmit and receive RTP payload type
values.
voIpProt.SDP.answer.
useLocalPreferences
0 or 1 0 If set to 1, the phones uses its own
preference list when deciding which codec to
use rather than the preference list in the offer.
If set to 0, it is disabled.