AudioCodes Mediant 1000B User Manual page 308

Parameter
CLI: coders-group-id
[IpProfile_CodersGroupID]
Web: Fax Signaling Method
CLI: fax-sig-method
[IpProfile_IsFaxUsed]
Web: Remote RTP Base UDP
Port
CLI: remote-base-udp-port
[IpProfile_RemoteBaseUDPPort
]
User's Manual
Group.
The value, Default Coders Group represents the coders configured
in the Coders table (see Configuring Coders on page 295). All
other optional values (e.g., Coders Group 1), represent the coders
defined for the specific Coder Group configured in the Coder Group
Settings table (see Configuring Coder Groups on page 298).
Defines the SIP signaling method for establishing and transmitting
a fax session when the device detects a fax.

[0] No Fax = (Default) No fax negotiation using SIP signaling.
The fax transport method is according to the FaxTransportMode
parameter.

[1] T.38 Relay = Initiates T.38 fax relay.

[2] G.711 Transport = Initiates fax/modem using the coder
G.711 A-law/Mu-law with adaptations (see Note below).

[3] Fax Fallback = Initiates T.38 fax relay. If the T.38 negotiation
fails, the device re-initiates a fax session using the coder G.711
A-law/ -law with adaptations (see the Note below).
Notes:

Fax adaptations (for options 2 and 3):

Echo Canceller = On

Silence Compression = Off

Echo Canceller Non-Linear Processor Mode = Off

Dynamic Jitter Buffer Minimum Delay = 40

Dynamic Jitter Buffer Optimization Factor = 13

If the device initiates a fax session using G.711 (option 2 or 3), a
'gpmd' attribute is added to the SDP in the following format:

For A-law: 'a=gpmd:8 vbd=yes;ecan=on'

For Mu-law: 'a=gpmd:0 vbd=yes;ecan=on'

When this parameter is set to 1, 2, or 3, the parameter
FaxTransportMode is ignored.

When this parameter is set to 0, T.38 might still be used without
the control protocol's involvement. To completely disable T.38,
set FaxTransportMode to a value other than 1.

For more information on fax transport methods, see Fax/Modem
Transport Modes on page 160.

The corresponding global parameter is IsFaxUsed.
Defines the lower boundary of the UDP port used for RTP, RTCP
(RTP port + 1) and T.38 (RTP port + 2). For example, if the Base
UDP Port is set to 6000, then one channel may use the ports RTP
6000, RTCP 6001, and T.38 6002, while another channel may use
RTP 6010, RTCP 6011, and T.38 6012, and so on. For more
information, see Configuring RTP Base UDP Port on page 174.
The range of possible UDP ports is 6,000 to 64,000. The default
base UDP port is 6000.
Notes:

For this parameter to take effect, a device reset is required.

If you set this parameter to a value that is not a factor of 10, the
following message is generated: "invalid local RTP port".

The UDP ports are allocated randomly to channels.

You can also configure a UDP port range per Media Realm (see
Configuring Media Realms on page 251).

The corresponding global parameter is BaseUDPPort.
308
Mediant 1000B Gateway & SBC
Description
Document #: LTRT-27034