Not recommended because incoming callers can get users to dial anywhere unrestricted, then conference and drop.
Most companies have this shut down to prevent toll fraud.
For trunk to trunk transfer to work the trunk-groups involved must have:
Disconnect Supervision - In? y Out? y
change system-parameters features Page 1 of 6
FEATURE-RELATED SYSTEM PARAMETERS
Trunk-to-Trunk Transfer: all
A great teacher, does not provide answers, but methods to teach others "How and where to find the answers"
bsh
35 years Bell, AT&T, Lucent, Avaya
Tier 3 for 25 years and counting