Re: Help with lookup() and save() for WebRTC traffic (dynamic instance ID issue)

Hi,

I was facing a similar problem, So i "registered" the client (instead of
"unregistered" user) which save() the same "auth-user" in the location
table.

Regards
Rajneesh

On Mon, Oct 13, 2025 at 9:31 PM Fernando Lopes via sr-users <
[email protected]> wrote:

> Hello Everyone,
>
> I'm having an issue with lookup() and save() when handling WebRTC traffic.
> I need to send the SIP response back to my client, but this client uses an
> instance ID that isn’t fixed — it changes between browsers and sessions.
>
> I’ve been trying to save the location using a custom URI, like this:
> xlog("L_INFO", "Instance ID: $fn\n");
> save("location", "0x00", "sip:[email protected]");
>
> and for lookup I’m using a simple:
> lookup("location");
>
> but get this error:
> lookup failed: Location lookup failed for user:
> 894aa72f-d7a3-437b-ac20-62b3943f7b5e
>
> I’ve checked the module docs here but I’m still unclear on how the lookup
> process works internally or what’s missing in my configuration.:
>
> https://kamailio.org/docs/modules/4.2.x/modules/registrar.html#registrar.f.lookup
>
> Here are my my logs:
>
> INFO: <script>: Instance ID: "bad2be9e-d9ff-41a8-8a19-5010acceb09d"
>
> kamcmd ul.dump
> {
>         Domains: {
>                 Domain: {
>                         Domain: location
>                         Size: 1024
>                         AoRs: {
>                                 Info: {
>                                         AoR:
> "894aa72f-d7a3-437b-ac20-62b3943f7b5e"
>                                         HashID: -680662917
>                                         Contacts: {
>                                                 Contact: {
>                                                         Address:
> sip:[email protected]
>                                                         Expires: 480
>                                                         Q: -1
>                                                         Call-ID:
> fkjjsrvt84dkc6a33dsb
>                                                         CSeq: 4
>                                                         User-Agent: n/a
>                                                         Received: sip:
> 172.31.208.1:64941;transport=ws
>                                                         Path: [not set]
>                                                         State: CS_NEW
>                                                         Flags: 0
>                                                         CFlags: 0
>                                                         Socket: udp:
> 10.5.0.8:5060
>                                                         Methods: -1
>                                                         Ruid:
> uloc-68ed19b3-31-1
>                                                         Instance: [not set]
>                                                         Reg-Id: 0
>                                                         Server-Id: 0
>                                                         Tcpconn-Id: -1
>                                                         Keepalive: 0
>                                                         Last-Keepalive:
> 1760369199
>                                                         KA-Roundtrip: 0
>                                                         Last-Modified:
> 1760369199
>                                                 }
>                                 }
>                         }
>                         Stats: {
>                                 Records: 2
>                                 Max-Slots: 1
>                         }
>                 }
>         }
> }
> Any ideas on how to make lookup() find the right record or how to properly
> handle this dynamic instance ID scenario for WebRTC clients?
>
> Thank you.
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