Hello, I have the following problem:
I used an analog telephone exchange in one location in combination with an alarm exchange that was connected to the security company’s alarm center.
And the communication to the call center over the analog line worked properly.
Afterwards, the old power plant was replaced with UCM 6202 at the same location.
The plan was to continue communication via the analog FXS port at the UCM 6202 exchange.
The FXS port on the exchange is set up and working properly…when an alarm occurs, the alarm control panel makes a regular call via the FXS port on UCM 6202, but the alarm center reports that they have not received anything that their center can recognize.
I have very little technical support from the security company so I have to test only on my own and try to fix the problem.
What I would like to mention is that the ISP has set up a sip trunk to the UCM 6202 ip exchange…an analog line was raised from the same provider before this, i.e. an analog line over their ATA device.
My assumption is that some signal distortion occurs when sending DTMF tones from the UCM 6202 to the security company’s alarm center.
Current settings on UCM 6202:
*DTMF Mode: Inband
*Jiter Buffer Adaptiv Size 100, Max 400 (I experimented with these things)
*Echo Cacellation ON (I experimented with these things)
I did a few combinations but i didn’t get the correct call.
I also did captured packets when the alarm was triggered…I did the analysis RTP stream (with Wireshark)…and I see that they are correct…I record them and return the tone to one of the DTMFChecker and get the numbers that were sent.
Does anyone have any idea what else I can try?