Avaya Communication Manager Administrator's Manual page 492

Managing Trunks
Synchronization Plan — Assigns primary and secondary external synchronization
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sources for the ISDN-BRI Trunk or DS1 circuit pack. Complete all screen fields as
required.
Note:
ISDN-BRI and ISDN-PRI interfaces cannot be mixed in the same trunk group.
Note:
Therefore, consider the following:
- The earliest trunk member (the lowest numbered one) administered is considered
correct.
- If an offending member is subsequently found (meaning the first member was BRI
and a later member was PRI, or vice versa), the cursor positions on the offending
member, and the following error message appears: You cannot mix BRI and PRI
ports in the same trunk group.
492 Administrator Guide for Avaya Communication Manager