[Serusers] Problem with SER + Micronet SP/5050s gateway

[Jiri Kuthan]

Hi Laco,

I think this Micronet problem, if it really happens the way you present
it, is too bad to be fixed on SER part. I'm unfortunately not aware of
another sub-$300 gateway other than Asterisk.

If you really wish to hack it, you would need either RFC3261-compliant
SIP Phone which does not compare TO URIs or you need to write a module
which stores the original To URI (perhaps as AVP) and restores replies
coming back. Getting this fixed throught complete dialog would take 
some additional work too and may be needed.

-jiri

At 08:20 PM 10/31/2004, Ladislav =?iso-8859-2?Q?Ivan=E8=EDk?= wrote:
>Hello, 
>
>I have Micronet SP/5050s as a gateways to PSTN (connection to PSTN via
>PBX), SER as a proxy server and some voip phones. Next picture shows my
>topology:
>
> _________     _______      _________      _____ 
>|SIP Phone|___|  SER  |____|SP 5050/S|____|PBX1 |____ PSTN
>|_________|   |_______| |  |____1____|    |_____|
>                        |
>                        |     . . . 
>                        |   _________      _____ 
>                        |__|SP 5050/S|____|PBXn |____ PSTN      
>                           |____n____|    |_____|
>                                        (in other location)
>
>
>If voip user calls some number, his UA sends INVITE message (to SER)
>with Request-uri=To-uri=number1 at domena.sk.
>
>My SER overwrite Reguest-uri to number2 at ip_address_of_micronet an sends
>this INVITE message to Micronet. INVITE includes Reguest-uri which is
>different from To-uri. I need dial number2 in PBX. 
>
>Note: Number1 may contain prefix - it tell which PBX use. SER must
>prepare real PSTN number - number2 and send INVITE message to corect
>gateway.
>
>My problem is that micronet gateway dials numbers from To-uri field, not
>from Request-uri field of INVITE message. So it dials number1. All
>numbers managed by SER are not available. 
>
>I can overwrite called number (number1 from To-uri) in micronet gateway
>too - gateway uses prefixes, but only 10 - it is few for me. And I need
>more micronet gateways with different prefixes (I have more PBX each in
>other place) - micronet's prefixes decentralize number logic from one
>SER to more gateways.
>
>I was trying to overwrite To-uri field of phone's INVITE message in SER,
>but if SER sends other message with overwrite To-uri (200 OK, ACK, reply
>from micronet) to phone, phone rejects it - message has wrong To-uri
>field.
>
>When I has Cisco 2600 as a PSTN gateway - it dialed numbers from
>Reguest-uri field, but Cisco is more expensive.
>
>Do you know some solution for me or other gateway, which can I use -
>gateway must dial numbers from Reguest-uri field and its price is circa
>300$ (PSTN gateway with 6 FXO ports).
>
>Thank you,
>
>Regards,
>Laco
>
>
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--
Jiri Kuthan            http://iptel.org/~jiri/