[Users] Error using subst function

[Bogdan-Andrei Iancu]

Hi Dimitry,

for RURI there are less costly functions to save your purpose (regexps 
are usually more inefficient as performance). Try:
    prefix("78142");
    rewritehostport("voapp.ru");

for To hdr, you have no alternative than using regexp. But as openser 
keeps the changes as diffs to the original (diffs that are applied only 
when the message is sent out), the regexp will apply all the time to the 
original. So, you have to make the changes with only one "subst".

regards,
bogdan

Dmitry Lyubimkov wrote:

>We need to make 2 transformations in URI and To field 
>1. Convert telephone number to to format E.164
>2. To correct a domain part of the address if it is set incorrectly by
>stupid UA
>
>All this is done through set of if operators because every of
>transformations can be absent or can be done on own algorithm. Let's
>consider a special case. We have on an input 799111 at 62.33.22.14 and on
>an output should receive 78142799111 at voapp.ru 
>URI will be transformed by these commands
>subst_uri("/^sip:([0-9]+)@(.*)/sip:78142\1@\2/i");
>subst_uri("/^sip:([0-9]+)@(.*)/sip:\1 at voapp.ru/i");
>To field will be transformed by these commands
>subst("/^To:(.*)sip:([0-9]+)@(.*)/To:\1sip:78142\2@\3/i");
>subst("/^To:(.*)sip:([0-9]+)@([0-9]+)\.([0-9]+)\.([0-9]+)\.([0-9]+)(.*)/
>To:\1sip:\2 at voapp.ru\7/i");
>
>We test and get dump of messages using tcpdump
>We receive from UA
>INVITE sip:705353 at 62.33.22.14 SIP/2.0
>Via: SIP/2.0/UDP 192.168.13.15
>From: ......._1 <sip:gan at 192.168.13.15>;tag=22683200-29298-10909
>To: <sip:705353 at 62.33.22.14>
>............
>
>We make transformation and sent following:
>INVITE sip:78142705353 at voapp.ru SIP/2.0
>Max-Forwards: 10
>Record-Route: <sip:62.33.22.14;ftag=22683200-29298-10909;lr>
>Via: SIP/2.0/UDP voapp.ru:5060;branch=z9hG4bKa4db.e5fa9a02.0
>Via: SIP/2.0/UDP 192.168.13.15;rport=53809;received=217.107.59.194
>From: ......._1 <sip:gan at 192.168.13.15>;tag=22683200-29298-10909
>To: <sip:78142705353 at 62.33.22.14>
>To: <sip:705353 at voapp.ru>
>...............
>
>As you can see URI was transformed correctly
>And instead of To field we have 2 To fields everyone corresponding to
>one of transformations.
>It is a bug? Or it is feature OpenSER? Whether it is possible to bypass
>this restriction?
>
>I understand that it is possible to make one subst call instead of two
>calls.
>subst("/^To:(.*)sip:([0-9]+)@([0-9]+)\.([0-9]+)\.([0-9]+)\.([0-9]+)(.*)/
>To:\1sip:78142\2 at voapp.ru\7/i");
>But in a reality the algorithm is much more complex. And that instead of
>several consecutive transformations to leave one it is required to use a
>many of if operators. It is very inconvenient, conducts to mistakes and
>reduces readability of a code.
>
>Dmitry
>
>
>
>
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