[OpenSIPS-Users] Presence behind NAT

[Callum Guy]

Hi All,

Hopefully a simple question related to the behaviour of the presence module
on my registrar.

I have configured OpenSIPs to enable dialoginfo updates against specific
user agents. When the user agent places/receives a call the PUBLISH event
is generated correctly. This resolves a UA at a locally served domain and
pushes the request out to the public address of the local server.  In my
environment this server is behind NAT and we end up seeing requests being
generated and sent from the internal interface to the public address of the
sending server which seems wrong, at at least inefficient.

Is anyone able to suggest an improvement to my configuration, perhaps I can
improve domain awareness somehow? Is this the correct behaviour?

Many thanks,

Callum

----

Relevant configuration (running OpenSIPs 3.0.1):

loadmodule "presence.so"
loadmodule "presence_dialoginfo.so"
loadmodule "pua.so"
loadmodule "pua_dialoginfo.so"

modparam("presence", "server_address", "sip:*public-ip*:5060")
modparam("presence", "mix_dialog_presence", 1)
modparam("presence", "fallback2db", 1)
modparam("presence", "max_expires_subscribe", 14700)
modparam("presence", "max_expires_publish", 14700)

...

# Fired when placing a call
route[ENABLE_BLF_CALLER] {
    xlog("L_INFO", "INFO: Enabling presence for calling party ($fu)
ID:$ci\n");
    dialoginfo_set("A");
}

# Fired when receiving a call
route[ENABLE_BLF_CALLEE] {
    xlog("L_INFO", "INFO: Enabling presence for called party ($ru)
ID:$ci\n");
    dialoginfo_set("B");
}

---

Example transmission:

192.168.153.210:5060 -> PUBLIC-IP(of example.com):5060

PUBLISH sip:12345 at example.com SIP/2.0
Via: SIP/2.0/UDP 192.168.153.210:5060;branch=z9hG4bK4316.2ff8a84.0
To: sip:12345 at example.com
From: <sip:12345 at example.com>;tag=260776ec80eaeff43e316f7930643583-5872
CSeq: 10 PUBLISH
Call-ID: 0168d45862da3b23-189847 at 192.168.153.210
Max-Forwards: 70
Content-Length: 643
User-Agent: me
Event: dialog
Expires: 301
Content-Type: application/dialog-info+xml

<?xml version="1.0"?>
<dialog-info xmlns="urn:ietf:params:xml:ns:dialog-info" state="partial"
entity="sip:12345 at example.com"><dialog
id="1ca15ca3-215b-4d9d-b401-770408889a6a_I_3150144_A0_5da442c9a33f9.0"
call-id="1ca15ca3-215b-4d9d-b401-770408889a
_I_3150144_A0_5da442c9a33f9" local-tag="1323791516"
remote-tag="UvKaaK3vUvega"
direction="recipient"><state>early</state><remote><identity>
sip:01728726500 at 192.168.153.226</identity><target uri="
sip:01728726500 at 192.168.153.226"/></remote><
cal><identity>sip:12345 at example.com</identity><target uri="
sip:12345 at example.com"/></local></dialog></dialog-info>

-- 





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