[asterisk-users] put fxo channel before E1 channel?

[d tbsky]

hi:
 my system has one 4-port fxo card and one 2-port E1 card.
 for some reason, i like to place fxo as channel 1-4, and E1 use the
rest channels (5-66).
 i modify zaptel.conf, and "ztcfg -vv" is happy. but asterisk seems
not happy with
this configuration. it still want channel 16 as D-channel, in my case
the D-channel should
be 20. i don't know if this is a limit of asterisk. i play some
parameters in zapata.conf
like trunkgroup. but i still can not get it work.
 any suggestion? or it is not allowed?
 thanks for your help!!

Regards,
tbskyd