[SIPForum-discussion] outgoing phone number

[Barry Weiss]

In my experience, some carriers will accept a Toll Free number (TFN) as the
calling party number (CGPN) which the call will complete. However, other
carriers like AT&T for example will not route your traffic if you have a TFN
as the CGPN. In most instances, some sort of valid billing number needs to
be provided from field. Although the Remote Caller-ID field in your SIP
messaging can have the the TFN, there has to be some sort of 10 ANI that
is billable in the From field of the invite.

On Wed, Aug 4, 2010 at 8:49 AM, Dave Jacobson <
djacobson at americantechnologypartners.com> wrote:

>  What do I do if I have a subscriber that only has a toll-free number and
> the subscriber places a call to the PSTN?  What do I use for the outgoing
> phone number if the PSTN will not accept the subscriber’s toll-free number
> as the outgoing phone number?  How can I set up the headers so that I do not
> violate any rules?
>
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