Multiple vTiger with single Asterisk

I am planning to use multiple vTiger with a single Asterisk Server.
Though it seems tough as the vTiger is version 6.1 and Asterisk is 1.8 that has a CONNECTOR for making calls. the connector can have only single URL thus we cannot configure multiple vTiger URL on the same.
I am planning to use the earlier version of vTiger that is 5.4 and also of the Asterisk that was 1.4 or 1.6. those versions donot require a connector for calls. Will it be possible to configure the SINGLE ASTERISK with multiple vTIGER CRMs ?