Hello Oscar welcome to the forum,
Can you please send me a private message with the customer in questions address and number so we can investigate?
If you have Polycom phones this should work for you.
Here is what I did.
You will need a Bogen Universal Telephone Interface (UTI1) about $160 buck on Amazon.
Have Comcast set a extention to ring to an ATA. From the ATA (port 1 on my Cicso) run the phone cord to the UTI "Station Port".
Follow the instruction on the PDF linked below.
I just connected the ATA (AudioCodes MP-114) to a Bogen paging amplifier.
I used a Viking PA-2A - about $80.
Folks will be glad to assist with the simple configuration. Very Simple!
@MikeWV, if you have any notes or diagrams or anything when you guys did this, it would be most helpful! We are moving from our old Avaya Partner phone system to Comcast BVE in a couple weeks and need some help with the planning of replacing the 20+ year old paging equipment with what you guys did. Also, how many horns did you guys use with the Viking you mentioned? We currently have and will need 6 in our plant.