[Serusers] Rewriting "From" / Setting caller number for PSTN calls

Atle Samuelsen clona at camaro.no
Fri Feb 27 23:58:12 CET 2004

This is the oppesit of what Im doing...

 but would you be needing a thing that rewrote the realname feeld? if
 so.. Im thinking of writing one, that can get a name out of the
 database, and say that "493042423" is Peter Pan.


 - Atle
* Arnd Vehling <av at nethead.de> [040227 20:37]:
> Hi,
> with an usuall SER setup a typical user account looks like this:
> Primary sip address: sip:joe at myvoip.net
> Aliases:
> Berlin incoming number: sip:493042423 at myvoip.net
> Los Angeles ""        : sip:1310232323 at myvoip.net
> If "joe" now calls out via a PSTN-GW the caller-id which is
> transmitted to the PSNT-GW would be "joe". Now "Joe" is clearly
> alphanumeric and no PSTN-GW (or the PSTN-Switch to which the PSTN-GW
> is connected) will accept "Joe" as caller-id.
> All i can currently do is setting a default callerid on the PSTN-GW
> in case the incoming caller-id isnt valid.
> What i would like to do though is to lookup if a user has an alias
> for a certain region and rewrite the the from line in the sip-packet
> going to the PSTN-GW.
> Example: "Joe" uses the Berlin/german PSTN-GW or dials a german PSTN 
> number. Now i would look into the alias table and search for either an
> alias starting with "49" or "4930" and if one is found set the from
> field to the according alias. In this case "493042423 at myvoip.net".
> This would ensure that, if possible, a matching caller-id would be
> set for every user.
> Problems:
> - "From" line rewriting is not RFC compliant.
> - I dont see any possebility to do this with the stock SER software
> Questions:
> - Which module would be a good starting point for adding this
>   functionality? All which would be needed would be one command
>   for looking up the alias list of a user from memory using regular
>   expressions.
> - How do others cope with this problem?
> The easy but not very elegant solution is to just use a valid e.164
> number (ex. the LA number) as primary sip address. But that still doesnt 
> fix the problem that "Joes" Los Angeles number would be set as caller-id 
> even if he got a valid "berlin" number too and calls via a german PSTN 
> termination.
> best regards,
>   Arnd
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