[SR-Users] Kamailio 4.3 Rewriting From and db_alias values

[Gonzalo Gasca Meza]

Hi forum,

This is the scenario:

VM <- Kamailio -> SP1 ----- SP2 ---- PhoneA (john)
PhoneB

PhoneA is configured in *dbaliases* table:
alias_username, alias_domain, username, domain
11111111, sp1.com, john, sp2.com

When PhoneB dials 1111111, Kamailio converts 111111 at sp1.com to john at sp2.com
Now I need to provide VM services to PhoneA. (Opposite direction)
PhoneA calls voicemail but the calling number is john at sp2.com
I need to have SP1 use the 11111111 at sp1.com format

How can I overwrite the From?

Pseudo algorithm
------------------------

If destination is VM and from domain ($fU) is sp2.com:
   Find user URI:  ( In this case john extracted from john at sp2.com in
dbaliases)
      If user is found:
        rewrite From URI:
            use alias_username at alias_domain

I'm using default kamailio.cfg and calls successfully are forwarded to VM

Thank you
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