trouble calling off-site VoIP phones with DDI

[d-mgr]

Users @ site with CS inbound ddi works fine

VoIP sets or softphone users off-site-inbound call rings quick at set then stops, caller gets cannot complete call.

T3 trace gets
INVALID CALL REFERENCE VALUE

Any ideas?

[Mr T]

Sounds like a codec issue, what codec are you using for the remote users?

[d-mgr]

Everything was good on my side.turned out to be carrier protocol. Carrier resolved issue. Thanks.