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Purpose of CO-Lines

In TDM-based PBX, there were a number of physical lines connecting the PBX with the public telephone network. These lines were called "CO-lines".

It is interesting to see what calls are active on the CO-lines. Over the centuries that PBX have been used, office users got used to CO-lines and they do expect at least the same behavior from a modern SIP-based PBX.

In SIP, there are no more physical cables used to connect the PBX with the outside world. However, it is still interesting to see which calls are active between the PBX and the outside world. Therefore, the pbxnsip emulates the behavior of the TDM-based PBX.

CO-lines are associated with trunks. Each trunk may have several CO-lines. Because users can subscribe to the state of the CO-lines, their name must be unique in the domain like for all other accounts.

For example, you can set up four CO-lines on Trunk1 with the name "co1 co2 co3 co4" and more CO-lines on Trunk2 with different names like "co5 co6 co7 co8" (the list of CO-lines must be separated by space). The PBX will reject names for the CO line that are already used by accounts or other CO-lines in the same domain. The CO-lines are listed in the account list, because they share the same namespace.

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