Polycom IP 320 Administrator's Manual page 197

Attribute
voIpProt.SDP.
useLegacyPayloadTypeNegotiation
voIpProt.SDP.answer.
useLocalPreferences
voIpProt.SDP.iLBC.13_33kbps.
includeMode
voIpProt.SDP.early.answerOrOffer
SDP <SDP/>
This configuration attribute is defined as follows:
Permitted
Values
0 or 1
0 or 1
0 or 1
0 or 1
Default Interpretation
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.
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.
Note: If a H.323 call from a Polycom VVX
1500 selects a lower-quality codec (H.261)
but the called device also support H.264, this
parameter should be enabled to resolve the
situation.
Null If set to 1 or Null, the phone should include
the mode=30 FMTP attribute in SDP offers:
• If voice.codecPref.iLBC.13_33kbps is
set and
voice.codecPref.iLBC.15_2kbps is
Null.
• If voice.codecPref.iLBC.13_33kbps
and voice.codecPref.iLBC.15_2kbps
are both set, but iLBC 13.33 kbps codec
is set to a higher preference.
If set to 0, the phone should not include the
mode=30 FTMP attribute in SDP offers even
if iLBC 13.33 kbps codec is being advertised.
Refer to Codec Preferences <codecPref/>
.
page A-45
Null If set to 1, an SDP offer or answer is
generated in a provisional reliable response
and PRACK request and response.
If set to 0, an SDP offer or answer is not
generated.
Note: An SDP offer or answer is not
generated if the user (reg.x) is configured for
the Music On Hold. Refer to
<musicOnHold/>
Configuration Files
Music on Hold
on page A-21.
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