Record the announcement using an analog telephone or a good quality DTMF touch-tone keypad that has a direct electrical connection.
Do not exceed 6.25 digits per second when generating the DTMF digits that are recorded.
For DTMF signaling to the network, the Call Center/PBX DTMF generation must send DTMF tones with a minimum of 80 milliseconds (ms) of digit duration and 80 ms of inter-digit silence, and include a pause of a minimum of 350 ms between the *8 and the redirection number. The lower and upper bounds are 300 ms - 11 seconds.
Minimize the recording of noise or periods of silence.
You cannot record DTMF tones using IP phones or record H.248 Media Gateway Virtual Voice Announcement over LAN (VVAL) announcement sources using any type of telephone. Instead, you must choose any of the following:
Record DTMF to port network TN2501 VAL boards using an analog telephone connected to the same port network. You can transfer the created wave files to H.248 Media Gateway VVAL or Avaya Aura® Media Server sources.
Record the DTMF tones using a commercially-available personal computer software tool such as Vox Studio. You can transfer the saved wave file to the desired Media Gateways.
