[OpenSIPS-Devel] [ opensips-Patches-2831868 ] removing existing contact with ip:port like new contact

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Patches item #2831868, was opened at 2009-08-04 10:12
Message generated for change (Comment added) made by ibc_sf
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Category: modules
Group: trunk
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Vladimir Kuznetsov (kuznetsov82)
Assigned to: Bogdan-Andrei Iancu (bogdan_iancu)
Summary: removing existing contact with ip:port like new contact

Initial Comment:
When SIP-client app lost network, other client can send REGISTER with the same IP:PORT. You can resolve this problem by usin this patch.

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Comment By: Iñaki Baz Castillo (ibc_sf)
Date: 2009-08-05 13:02

Message:
Vladimir, you are "solving" a problem which is not a problem. This just
solves a *client* problem in your escenario but breaks RFC 3261
specifications since multiple AoR registrations are allowed from the same
address:port.

I use Tinkle softphone which allows me having 10-50 different SIP accounts
registered at the same time, and it uses the same address:port for all.
This is perfectly valid according to RFC 3261 and your patch woudl break
it.

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Comment By: Bogdan-Andrei Iancu (bogdan_iancu)
Date: 2009-08-05 12:43

Message:
I see. But such a auto-removal will affect devices with multiple lines.
Ex:
1) device registers Line 1 (AOR1) with contact 10.10.10.10:1234
2) device registers Line 2 (AOR2) with contact 10.10.10.10:1234 ->usrloc
will remove the registration of the first line, as it has the same IP and
port

Regards,
Bogdan

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Comment By: Vladimir Kuznetsov (kuznetsov82)
Date: 2009-08-05 07:30

Message:
Example:
Step 1: CLIENT1 send REGISTER from 10.10.10.10:1234.
Step 2: CLIENT1 lost network
Step 3: CLIENT2 connecting to network and receive IP 10.10.10.10
Step 4: CLIENT2 connecting to SIP server with this IP and port 1234 (He
send REGISTER from 10.10.10.10:1234)
Step 5: somebody calls to CLIENT1 -> CLIENT2 has incoming call because he
has ip:port like CLIENT1 and REGISTER timeout for CLIENT1 was not expired.

This problem we have using mobile WiMAX network. This patch resolve this
problem:
when CLIENT2 send REGISTER, SIP server delete record for CLIENT1 from
database. We set flag db_mode=DB_ONLY for usrloc module and this patch can
be using only with this flag.

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Comment By: Bogdan-Andrei Iancu (bogdan_iancu)
Date: 2009-08-04 23:40

Message:
Hi Vladimir,

could you explain a bit more in details what the patch provides? an
example will be really helpful here.
I'm asking as the I want to be sure that whatever change you need, it is
not against the RFC3261 (on how the user registration and contact matching
works).

Thanks and regards,
Bogdan

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