You can use the AT&F[<profile>] and ATZ[<profile>] commands to select a TTY profile. The following profiles are supported:
Profile |
Description |
14 |
Autodetection of B-channel protocol. See Incoming RAS Call Type Autodetection for details. |
1 |
X.75/Transparent/Transparent protocol stack. Data compression in accordance with V.42bis is detected automatically for incoming calls. |
2 |
V.110 synchronous mode. |
3 |
V.110 asynchronous mode. |
4 |
Synchronous modem with V.42/V.42bis. |
5 |
Asynchronous modem (up to V.90) with full negotiation and V.42/V.42bis/MNP. |
6 |
V.120, 64 kbps, V.42bis compression auto-detection for incoming connections |
7 |
V.120, 56 kbps, V.42bis compression auto-detection for incoming connections |
8 |
Bit-transparent access to B-channel data [a] |
9 |
HDLC/Transparent/Transparent protocol stack that is widely used for PPP connections [b]. |
10 |
Same as profile 9, but with 56000 bps |
11 |
BTX |
12 |
BTX |
15 |
X.75 with data compression in accordance with V.42bis. This profile should be used for outgoing calls if you wish to use data compression in accordance with V.42bis. If the opposite side does not support data compression, the connection will be established without data compression. |
16 |
PIAFS 1.0 32 kbps [c] |
17 |
PIAFS 2.0 64 kbps [c] |
18 |
PIAFS 2.1 32/64 kbps [c] |
Notes:
[a] By default, this profile does not switch to data mode after the
connection was established.
[b] This profile switches to numeric mode (ATV0) and "echo off"
(ATE0) by default.
[c] You can use the AT+iE command to activate the CHINA PIAFS protocol
extension.