I am currently deploying Cisco VoIP to a number of sites. Some of these sites currently have B1/POTs lines, some have DID & CO trunks. Is there a difference between a CO trunk and a regular land line/B1? Can you terminate a CO trunk directly on a analog device like a Fax machine?
The question is probably elementary but I cant find anything specific on the differences between them.
Is there any difference in quality of the lines/trunk themselves?
I am having issues with Postage Machines at the sites. We can get them to work fine on PRI sites, however if the Postage Machine is trying to connect over a CO trunk the handshake fails. It seems to come down to the input gain/outout attenuation/impedance settings on the voice-port connected to the CO trunk. I can get it to work occasionally but its not consistent. Its basically two modems connecting to each other, same as a fax session.
We also have some sites that have B1 lines instead of CO/DID trunks. The B1 lines will be terminated on FXO ports on the router and be configured as a single trunk-group for all inbound/outbound calls.
I am curious if the B1 lines will have the same amount of static/noise on them as the CO Trunks. Is a B1/POTs line more clean than a CO Trunk, even if they are both terminated on FXO ports?