3Com Oven Release Notes page 13

Release Notes for 3Com Asterisk Appliance Release 1.4.0.14.3
exten = _s-.,1,NoOp
root:~>
If Bandwidth assigns a DID range of 5551231000 -1199, the caller ID for all outgoing calls
typically is a number from the above range with the characters +1 prepended. For example,
if a user at extension 1010 dials out, the caller ID would be +15551231010. Note that this
meets Bandwidth's requirements.
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