3Com VCX V7122 User Manual page 109

ini File Field Name
*
Web Parameter Name
EnableEarlyMedia
[Enable Early Media]
EnableTransfer
[Enable Transfer]
XferPrefix
[Transfer Prefix]
EnableHold
[Enable Hold]
EnableForward
[Enable Call Forward]
EnableCallWaiting
[Enable Call Waiting]
RxDTMFOption
[Declare RFC 2833 in
SDP]
3Com VCX V7122 SIP VoIP Gateway User Manual
Valid Range and Description
0 = Early Media is disabled (default).
1 = Enable Early Media.
If enabled, the VCX V7122 gateway sends 183 Session Progress response
with SDP (instead of 180 ringing), enabling the setup of the media stream prior
to the answering of the call. Sending 183 response depends on the Progress
Indicator. It is sent only if PI=1 or PI=8 was received in Proceeding or Alert PRI
messages. For CAS gateways see the 'ProgressIndicator2IP' parameter.
Note: Generally, this parameter is set to 1.
0 = Call transfer is not allowed.
1 = The gateway responds to a Refer message with "Referred To" header to
initiates a Call Transfer.
Defined string that is added, as a prefix, to the transferred called number,
when Refer/3xx message is received.
Note 1: The number manipulation rules apply to the user part of the Refer-
TO/Contact URL before it is sent in the Invite message.
Note 2: The xferprefix parameter can be used to apply different manipulation
rules to differentiate the transferred number from the original dialed number.
0 = Hold service disabled (default).
1 = Hold service is enabled, held tone is played to holding party.
0 = Disable call forward (default).
1 = Enable call forward service.
The VCX V7122 doesn't initiate call forward, it can only respond to call forward
requests.
0 = Disabled (default).
1 = Enabled.
If enabled, when the gateway initiates a Tel to IP call to a destination that is
busy, it plays a Call Waiting Ringback tone to the originator of the call.
Note 1: The gateway's Call Progress Tones file must include a Call Waiting
Ringback tone.
Note 2: The EnableHold parameter must be enabled on the called side.
Defines the supported Receive DTMF negotiation method.
0 = Don't declare RFC 2833 Telephony-event parameter in SDP.
1 = n/a.
2 = n/a.
3 = Declare RFC 2833 "Telephony-event" parameter in SDP (default).
The gateway is designed to always be receptive to RFC 2833 DTMF relay
packets. Therefore, it is always correct to include the "Telephony-event"
parameter as a default in the SDP. However some gateways use the absence
of the "telephony-event" from the SDP to decide to send DTMF digits inband
using G.711 coder. If this is the case you can set "RxDTMFOption=0".
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