Outbound not jumping to next trunk when first trunk is max

I am tb 2.2.3 and fb 2.2.2 I have a telasip sip trunk … max =1 and once if out going call is made on telasip and someone tries to make another call it dose not go to the next setting in outbound and sends it thru telasip and call fails … any help… Thanks in advance

setup for telasip

Trunk name — telasip-gw

PEER details

allow=g729&ulaw
context=from-trunk
disallow=all
fromuser=xxxxxxxx
host=4.79.19.59
insecure=very
qualify=yes
secret=xxxxxxxxxxxx
sendrpid=yes
type=peer