Woof! On Tue, Apr 6, 2010 at 9:47 AM, <[email protected]> wrote: > XX-7944 - only valid keys can/will stop recording
This is not a good idea. If DTMF gets into a recording, then when it gets played back it can echo back and be detected as if the far end pressed a digit. This is a lesson I learned the hard way a long time ago. Here is the situation: Caller left a message, pressed '4'. As '4' wasn't the 'stop' key, the audable DTMF tone got recorded into the message. The user called into to retrieve messages, and played back this caller's message. The '4' DTMF digit was played (as it was happily recorded). It echoed back weakly (side tone, or analog hybrid, or for whatever reason there was a small amount of echo back, like there is in the real world). As '4' was the 'delete' message, the echoed back DTMF was detected and acted on. The message deleted itself! This was not an isolated incident, it occurred rarely, but frequently enough to become a real problem. As you can imagine, it wasn't easy to figure out what the actual problem was, as for all reasonable checks it showed that the caller pressed 4. Unless there is a way to suppress the DTMF audio from the recording, I suggest that you back out this change and force any detected DTMF to end the recording, lest you suffer the same problems going forward. --Woof! _______________________________________________ sipx-dev mailing list [email protected] List Archive: http://list.sipfoundry.org/archive/sipx-dev Unsubscribe: http://list.sipfoundry.org/mailman/listinfo/sipx-dev sipXecs IP PBX -- http://www.sipfoundry.org/
