---
name: "t38modem"
section: "1"
platform: "linux"
package: "t38modem"
version: "0.8.4-2+b1"
release: "Debian 5.0 (Lenny)"
platforms: ["linux"]
url: "https://new.carta.tech/t38modem"
---

# t38modem(1)

T.38 modem emulator

## NAME

T38Modem - T.38 modem emulator

## DESCRIPTION

T38Modem Version 0.8.4

-

  by OpenH323 Project on Unix Linux (2.6.22-3-vserver-amd64-x86\_64)

Usage : T38Modem \[options\] Options:

- **-p** **--ptty** \[num@\]tty\[,...\] : Pseudo ttys (mandatory).

  Can be used multiple times. If tty prefixed by num@ then tty will accept incoming calls only for numbers with prefix num. Use none@tty to disable incoming calls. See Drivers section for supported tty's formats.

- **--route** prefix@host\[,...\] : Route numbers with prefix num to host.

  Can be used multiple times. Discards prefix num from numbers. Use 'all' to route all numbers. Mandatory if not using GK.

- **--redundancy** I\[L\[H\]\]

  : Set redundancy for error recovery for (I)ndication, (L)ow speed and (H)igh speed IFP packets. I, L and H are digits.

- **--old-asn**

  : Use original ASN.1 sequence in T.38 (06/98) Annex A (w/o CORRIGENDUM No. 1 fix).

- **-i** **--interface** ip

  : Bind to a specific interface.

- **--no-listenport**

  : Disable listen for incoming calls.

- **--listenport** port

  : Listen on a specific port.

- **--connectport** port

  : Connect to a specific port.

- **--ports** T:B-M\[,...\]

  : For (T)ype set (B)ase and (M)ax ports to use. T is 'udp', 'rtp' or 'tcp'. B and M are numbers.

- **-g** **--gatekeeper** host

  : Specify gatekeeper host.

- **-n** **--no-gatekeeper**

  : Disable gatekeeper discovery.

- **--require-gatekeeper**

  : Exit if gatekeeper discovery fails.

- **-F** **--fastenable**

  : Enable fast start.

- **-T** **--h245tunneldisable**

  : Disable H245 tunnelling.

- **-G** **--g7231enable**

  : Enable G.723.1 codec, rather than G.711.

- **-D** **--disable** codec

  : Disable the specified codec. Can be used multiple times.

- **-P** **--prefer** codec

  : Prefer the specified codec. Can be used multiple times.

- **-u** **--username** str

  : Set the local endpoint name to str.

- **-t** **--trace**

  : Enable trace, use multiple times for more detail.

- **-o** **--output** file

  : File for trace output, default is stderr.

- **--save**

  : Save arguments in configuration file and exit.

- **-v** **--version**

  : Display version.

- **-h** **--help**

  : Display this help message.

### Drivers:

-

  PTY

-

  Uses pseudo-tty (pty) devices to communicate with fax application. The tty should match to regexp '^(/dev/)?tty\[pqrstuvwxyzabcde\]\[0123456789abcdef\]$'.

-

  by OpenH323 Project on Unix Linux (2.6.22-3-vserver-amd64-x86\_64)