PRI trunks can be set to a number of different line subtypes.

For Quick systems: PRI, T1 and ETSI.

For Partner systems: PRI or T1.

For Norstar systems: ETSI.  

PRI
Available for Canada, Mexico and United States. Supports up to 23 channels.

T1
Available for Canada, Mexico and United States. Supports up to 24 channels.

ETSI
Available for countries other than Canada, Mexico and United States. Supports up to 30 channels.

 

IP500 PRI Channel Licenses
The IP500 PRI 1 trunk daughter card supports the use of its first 8 channels unlicensed. Use of additional channels require licenses to be added to the configuration. The maximum number of channels depends on the current Line Sub-Type setting of the PRI trunk.