[asterisk-users] Global number rewriting rules affecting ALL headers?

Joshua C. Colp jcolp at sangoma.com
Tue Nov 19 05:08:52 CST 2019

On Tue, Nov 19, 2019 at 6:11 AM Benoit Panizzon <benoit.panizzon at imp.ch>

> Hi List
> One more Problem I stumbled upon.
> Using Asterisk in a TSP environement.
> Incomming IC Calls are e164 and have a NPRN (Routing Number) prefixed.
> Example: +4198055615995555
> +41 country prefix
> 98055 Routing Prefix
> 615995555 effective phone number
> Calls routed to Customers need to be put in the 'local' format.
> 0615995555
> This is also the format of the From / To / Invite header recieved from
> customers.
> Phone Numbers originating from customers have again to get manipulated:
> If this is a ported number to another TSP, the destination TSP NPRN has
> to be inserted so it can correctly be routed in transit.
> If it is a emergency phone number, a location based routing prefix has
> to be added.
> If it is a value added number, the NPRN of the operator AND and ID
> designating the originator TSP of the call has to be prefixed for
> billing.
> In the Dialplan (also with help of some AGI Magic doing screening and
> routing) it is easy to correctly set the Request User, From and To
> Headers.
> Setting the PAI correctly was also doable via a pre-dial handler.
> But now I am stuck with the Diversion: header.
> If the call is being redirected by a SIP 301 from a customer, asterisk
> is setting a Diversion: Header in the 181 message alerting the caller
> of the Diversion and I am absolutely at a loss how I can correctly
> rewrite that phone number in this header.
> So I start to wonder, if there is some mechanism within
> asterisk on which I could apply correct phone number translations for
> each endpoint which would apply to ALL possible headers.

There is no hook to apply to everything, you have to write dialplan logic
in various places to do so. There are some cases where there are hooks -
redirecting (diversion) and connected line updates[1][2].


Joshua C. Colp
Digium - A Sangoma Company | Senior Software Developer
445 Jan Davis Drive NW - Huntsville, AL 35806 - US
Check us out at: www.sangoma.com & www.asterisk.org
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