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V7122 GatewayUser Guide
c=IN IP4 <IPAddressA
m=audio <udpPort A> RTP/AVP 18 0
a=ptime:10
a=rtpmap:96 PCMU/8000
a=gpmd: 96 vbd=yes
In the example above, V.152 implementation is supported (using the dynamic payload type
96 and G.711 mu-law as the VBD codec) as well as the voice codecs G.711 mu-law and
G.729.
Instead of using VBD transport mode, the V.152 implementation can use alternative relay fax
transport methods (for example, fax relay over IP using T.38). The preferred V.152 transport
method is indicated by the SDP ‘pmft’ attribute. Omission of this attribute in the SDP content
means that VBD mode is the preferred transport mechanism for voice-band data.
Event Notification using X-Detect Header
The gateway supports the sending of notifications to a remote party notifying the occurrence
(or detection) of certain events on the media stream. Event detection and notifications is
performed using the X-Detect SIP message header, and only when establishing a SIP
dialog.
For supporting some events, certain gateway configurations need to be performed. The table
below lists the support event types (and subtypes) and the corresponding gateway
configurations, if required:
Table 50
Supported X-Detect Event Types
Events
Required Gateway Configuration
Type
Subtype
AMD
voice
automata
silence
unknown
EnableDSPIPMDetectors = 1
AMDTimeout = 2000 (msec)
CPT
SIT SITDetectorEnable
=
1
UserDefinedToneDetectorEnable = 1
Note:
Differentiation of SIT is not supported in 5.0.
FAX
CED
(IsFaxUsed
≠
0) or (IsFaxUsed = 0 and FaxTransportMode
≠
0)
modem
VxxModemTransportType = 3
PTT
voice-start
voice-end
EnableDSPIPMDetectors = 1
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