Extron Electronics DMP 128 User Guide - Manual (Page 134)

third Party control of the Phone Dialer
See the SIS section for commands to control and query the phone dialer (see Telephone
commands on page 146).
When sending a dial command or off hook command using SIS commands, you must
first initialize the phone.
To prevent excessive levels from the dial tone, or on hook and off hook sounds,
fine control of the phone receive audio is recommended during dialing. Examples of
recommended phone control sequences follow:
Off hook:
1. Send receive mute SIS command to DMP.
2. Delay 100 ms.
3. Send initialize phone SIS command to DMP.
4. Send off hook SIS command to DMP.
5. Delay 100 ms.
6. Send receive gain -12 dB SIS command to DMP.
On hook:
1. Send receive mute SIS command to DMP.
2. Delay 100 ms.
3. Send on hook SIS command to DMP.
4. Delay 500 ms.
5. Send receive gain 0 dB SIS command to DMP.
Dial:
1. Send receive mute SIS command to DMP.
2. Delay 100 ms.
3. Send initialize phone SIS command to DMP.
4. Send off hook SIS command to DMP.
5. Send receive gain -12 dB SIS command to DMP.
6. Delay 200 ms.
7. Send dial number string SIS command to DMP.
8. Send receive gain 0 dB SIS command to DMP.
DMP 128 • Software Control 128