AudioCodes Mediant 800 User Manual page 469

CHAPTER 19 Coders and Profiles
Parameter
'SDP Ptime Answer'
sbc-sdp-ptime-ans
[IpProfile_
SBCSDPPtimeAnswer]
'Preferred Ptime'
sbc-preferred-ptime
[IpProfile_SBCPreferredPTime]
'Use Silence Suppression'
sbc-use-silence-supp
[IpProfile_
SBCUseSilenceSupp]
Mediant 800 Gateway & E-SBC | User's Manual
Description
SDP in outgoing 200 OK:
m=audio 6370 RTP/AVP 97 99
a=rtpmap:99 telephone-event/16000/1
a=fmtp:99 0-15
a=sendrecv
a=ptime:20
a=maxptime:120
a=rtpmap:97 AMR-WB/16000
a=fmtp:97 mode-change-capability=2;mode-
set=0,1,2,3,4,5,6,7,
Note: The parameter is applicable only to the SBC
application.
Defines the packetization time (ptime) of the coder in RTP
packets for the SIP entity associated with the IP Profile.
This is useful when implementing transrating.
■ [0] Remote Answer = (Default) Use ptime according to
SDP answer.
■ [1] Original Offer = Use ptime according to SDP offer.
■ [2] Preferred Value = Use the ptime according to the
'Preferred Ptime' parameter (see below) if it is
configured to a non-zero value.
Note:
■ Regardless of the settings of this parameter, if a non-
zero value is configured for the 'Preferred Ptime'
parameter (see below), it is used as the ptime in the
SDP offer.
Defines the packetization time (ptime) in msec for the SIP
entity associated with the IP Profile, in the outgoing SDP
offer.
If the 'SDP Ptime Answer' parameter (see above) is
configured to Preferred Value [2] and the 'Preferred Ptime'
parameter is configured to a non-zero value, the configured
ptime is used (enabling ptime transrating if the other side
uses a different ptime).
If the 'SDP Ptime Answer' parameter is configured to
Remote Answer [0] or Original Offer [1] and the 'Preferred
Ptime' parameter is configured to a non-zero value, the
configured value is used as the ptime in the SDP offer.
The valid range is 0 to 200. The default is 0 (i.e., a preferred
ptime is not used).
Defines silence suppression support for the SIP entity
associated with the IP Profile
■ [0] Transparent = (Default) Forward as is.
■ [1] Add = Enable silence suppression for each relevant
coder listed in the SDP.
■ [2] Remove = Disable silence suppression for each
relevant coder listed in the SDP.
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