Does your GSM dialler have two ports so that it makes a call via PSTN if available and then switches to GSM if not?
If so, you could connect your alarm panel into the Line port and your VoIP equipment (if you have any) into the PSTN port. Then you'd have to run some tests to find out if you can get signals through to a monitoring company using either your VoIP or GSM. If they both fail, as I expect they will, PM me and I will provide you with a phone number that will allow both of them to work. If you then want monitoring service I can can connect you to a Back to Base monitoring company on the Central Coast.
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