AudioCodes E-SBC User Manual page 1209

CHAPTER 68 Configuration Parameters Reference
Parameter
[NoAudioPayloadType]
'SIP Transport Type'
configure voip >
sip-definition
settings > app-sip-
transport-type
[SIPTransportType]
'Display Default SIP Port'
configure voip >
sip-definition
settings > display-
default-sip-port
[DisplayDefaultSIPPort]
Mediant 1000 Gateway & E-SBC | User's Manual
■ [0] = (Default) If the device is configured with a VBD coder
(see the CodersGroup parameter) and is negotiated OK at call
start, then both fax and modem signals are sent over RTP
using the bypass payload type (and no mid-call VBD or T.38
Re-INVITEs occur).
■ [1] = If the IsFaxUsed parameter is set to 1, the channel
opens with the FaxTransportMode parameter set to 1 (relay).
This is required to detect mid-call fax tones and to send T.38
Re-INVITE messages upon fax detection. If the remote party
supports T.38, the fax is relayed over T.38.
Note:
■ If VBD coder negotiation fails at call start and if the
IsFaxUsed parameter is set to 1 (or 3), then the channel
opens with the FaxTransportMode parameter set to 1 (relay)
to allow future detection of fax tones and sending of T.38 Re-
INVITES. In such a scenario, the FaxVBDBehavior
parameter has no effect.
■ This feature can be used only if the remote party supports
T.38 fax relay; otherwise, the fax fails.
Defines the payload type of the outgoing SDP offer.
The valid value range is 96 to 127 (dynamic payload type). The
default is 0 (i.e. NoAudio is not supported). For example, if set to
120, the following is added to the INVITE SDP:
a=rtpmap:120 NoAudio/8000\r\n
Note: For incoming SDP offers, NoAudio is always supported.
Determines the default transport layer for outgoing SIP calls
initiated by the device.
■ [0] UDP (default)
■ [1] TCP
■ [2] TLS (SIPS)
Note:
■ It's recommended to use TLS for communication with a SIP
Proxy and not for direct device-to-device communication.
■ For received calls (i.e., incoming), the device accepts all
these protocols.
Enables the device to add the default SIP port 5060 (UDP/TCP)
or 5061 (TLS) to outgoing messages that are received without a
port. This condition also applies to manipulated messages where
the resulting message has no port number. The device adds the
default port number to the following SIP headers: Request-Uri,
To, From, P-Asserted-Identity, P-Preferred-Identity, and P-
Called-Party-ID. If the message is received with a port number
other than the default, for example, 5070, the port number is not
changed.
An example of a SIP From header with the default port is shown
below:
- 1171 -
Description