Which Escort modules for a DSC 1550 Panels

I have an old DSC 1550 panel I'd like to add the escort voice module to.
Does anyone know what model escort went with these? Thanks in advance
Dave

Follow-Ups:
- Re: Which Escort modules for a DSC 1550 Panels
  - From: Roland
- Re: Which Escort modules for a DSC 1550 Panels
  - From: Petem

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