We have a new HT-503 running 220.127.116.11. The initial setup between the HT-503 and our Inductive Automation “Ignition” SCADA system was fairly easy, following the setup document provided by Inductive Automation. When an “Alarm” triggers a call out the system functions as expected. If the first person on the call list does not answer it appears the HT is signaling to the Ignition gateway that it is ready for the next call and the Ignition system is providing that information, but the HT then signals it is busy and the call process is canceled by the Ignition gateway. Does anyone have experience with this?
SIP and PSTN is separate.
It can be that SIP sent you cancel, but PSTN is not correctly configured and line cannot be put down.
Check if Line is down after such call.
In addition to Marcin’s comments, the HT has no idea about people or if the call has been answered to the extent you have indicated in the post.
It is the gateway that signals to the HT when placing a call. The gateway is sending the SIP INVITE to initiate a call. This causes the HT to seize the PSTN line connected to the FXO port and to dial the number provided. Once the HT has taken the PSTN line off-hook, it will remain off-hook until such time as either the signaling provided by the PSTN line indicates a disconnect or the SCADA device terminates the call. The HT is essentially a middle-man that relays information between devices.
Take an analog phone and connect it to the same POTS line and dial the number and see what happens. Simulate the same condition if you suspect that the call is not being answered. Insure that the tone settings are correct in the HT. You may also want to check the SCADA device and see what settings are available that you can use to terminate a call on its end.
I use these for a water district that has lift stations, chlorine alarms and the like with voice recordings such that when a condition is out of tolerance, the alarm input that triggered the alarm will signal (by virtue of the input block connected) what type of alarm it is which will trigger the reporting device to auto-dial the needed number via the HT and upon answer the device will play a recording associated to the alarm type so that the center receiving the call can react accordingly. Conversely, the center can dial back into each device to get a status report.