New subject: How to correctly answer a PnP-SUBSCRIBE message

30 Mar 2020

      Hello Daniel,
thank you for your reply.
I changed the line mentioned to
t_uac_send("NOTIFY", "$(ct{s.substr,1,0}{s.striptail,1})", "$su", "192.168.1.156","Call-ID: $hdr(Call-ID)\r\nSubscription-State: terminated;reason=timeout\r\nEvent: $hdr(Event)\r\nContent-Type: application/url\r\nFrom: $fU\r\nTo: $hdr(From)", "http://server.conf/settings-%7Bmac%7D http://server.conf/settings-%7Bmac%7D");
the result is:
3) Call-ID is fine now ; Problem solved :-)
1) The Via IP is now changed to the IP and port of the server, but not to the IP of the phone.
2) The sending interface  / IP is not correct: It now sends _only_ from the wrong IP !!
As a result, it repeats sending the NOTIFY-message over and over again since the message does not get to the phone ...
Please see the starting of the SIP-traffic below
U 192.168.1.152:57283 -> 224.0.1.75:5060 #53
SUBSCRIBE sip:MAC%3a0004137120D8@lan sip:MAC%3a0004137120D8@lan SIP/2.0.
Via: SIP/2.0/UDP 192.168.1.152:57283;rport.
From: <sip:MAC%3a0004137120D8@lan sip:MAC%3a0004137120D8@lan>;tag=176419003.
To: <sip:MAC%3a0004137120D8@lan sip:MAC%3a0004137120D8@lan>.
Call-ID: 277773303@192.168.1.152 mailto:277773303@192.168.1.152.
CSeq: 1 SUBSCRIBE.
Event: ua-profile;profile-type="device";vendor="snom";model="snom760";version="8.9.3.80".
Expires: 0.
Accept: application/url.
Contact: <sip:192.168.1.152:57283 sip:192.168.1.152:57283>.
User-Agent: snom760/8.9.3.80.
Content-Length: 0.
.
#
U 192.168.1.156:5060 -> 192.168.1.152:57283 #54
SIP/2.0 200 OK.
Via: SIP/2.0/UDP 192.168.1.152:57283;rport=57283;received=192.168.1.152.
From: <sip:MAC%3a0004137120D8@lan sip:MAC%3a0004137120D8@lan>;tag=176419003.
To: <sip:MAC%3a0004137120D8@lan sip:MAC%3a0004137120D8@lan>;tag=fb721cde02dffb6bb099728401306798.1182.
Call-ID: 277773303@192.168.1.152 mailto:277773303@192.168.1.152.
CSeq: 1 SUBSCRIBE.
Server: kamailio (5.2.5 (x86_64/linux)).
Content-Length: 0.
.
#
U 172.23.56.1:5060 -> 192.168.1.152:57283 #55
NOTIFY sip:192.168.1.152:57283 sip:192.168.1.152:57283 SIP/2.0.
Via: SIP/2.0/UDP 192.168.1.156:5060;branch=z9hG4bKee8f.0ea476a1000000000000000000000000.0.
To: <sip:MAC%3a0004137120D8@lan sip:MAC%3a0004137120D8@lan>;tag=176419003.
From: <MAC%3a0004137120D8>;tag=da567df9df3ac234e43969a051db4641-9700.
CSeq: 10 NOTIFY.
Call-ID: 277773303@192.168.1.152 mailto:277773303@192.168.1.152.
Max-Forwards: 70.
Content-Length: 33.
User-Agent: kamailio (5.2.5 (x86_64/linux)).
Subscription-State: terminated;reason=timeout.
Event: ua-profile;profile-type="device";vendor="snom";model="snom760";version="8.9.3.80".
Content-Type: application/url.
.
http://server.conf/settings-%7Bmac%7D http://server.conf/settings-%7Bmac%7D
#
U 172.23.56.1:5060 -> 192.168.1.152:57283 #56
NOTIFY sip:192.168.1.152:57283 sip:192.168.1.152:57283 SIP/2.0.
Via: SIP/2.0/UDP 192.168.1.156:5060;branch=z9hG4bKee8f.0ea476a1000000000000000000000000.0.
To: <sip:MAC%3a0004137120D8@lan sip:MAC%3a0004137120D8@lan>;tag=176419003.
From: <MAC%3a0004137120D8>;tag=da567df9df3ac234e43969a051db4641-9700.
CSeq: 10 NOTIFY.
Call-ID: 277773303@192.168.1.152 mailto:277773303@192.168.1.152.
Max-Forwards: 70.
Content-Length: 33.
User-Agent: kamailio (5.2.5 (x86_64/linux)).
Subscription-State: terminated;reason=timeout.
Event: ua-profile;profile-type="device";vendor="snom";model="snom760";version="8.9.3.80".
Content-Type: application/url.
.
http://server.conf/settings-%7Bmac%7D http://server.conf/settings-%7Bmac%7D
#
U 172.23.56.1:5060 -> 192.168.1.152:57283 #57
NOTIFY sip:192.168.1.152:57283 sip:192.168.1.152:57283 SIP/2.0.
Via: SIP/2.0/UDP 192.168.1.156:5060;branch=z9hG4bKee8f.0ea476a1000000000000000000000000.0.
To: <sip:MAC%3a0004137120D8@lan sip:MAC%3a0004137120D8@lan>;tag=176419003.
From: <MAC%3a0004137120D8>;tag=da567df9df3ac234e43969a051db4641-9700.
CSeq: 10 NOTIFY.
Call-ID: 277773303@192.168.1.152 mailto:277773303@192.168.1.152.
Max-Forwards: 70.
Content-Length: 33.
User-Agent: kamailio (5.2.5 (x86_64/linux)).
Subscription-State: terminated;reason=timeout.
Event: ua-profile;profile-type="device";vendor="snom";model="snom760";version="8.9.3.80".
Content-Type: application/url.
.
http://server.conf/settings-%7Bmac%7D http://server.conf/settings-%7Bmac%7D
#
U 192.168.1.152:57283 -> 224.0.1.75:5060 #58
SUBSCRIBE sip:MAC%3a0004137120D8@lan sip:MAC%3a0004137120D8@lan SIP/2.0.
Via: SIP/2.0/UDP 192.168.1.152:57283;rport.
From: <sip:MAC%3a0004137120D8@lan sip:MAC%3a0004137120D8@lan>;tag=1472545741.
To: <sip:MAC%3a0004137120D8@lan sip:MAC%3a0004137120D8@lan>.
Call-ID: 1886698335@192.168.1.152 mailto:1886698335@192.168.1.152.
CSeq: 1 SUBSCRIBE.
Event: ua-profile;profile-type="device";vendor="snom";model="snom760";version="8.9.3.80".
Expires: 0.
Accept: application/url.
Contact: <sip:192.168.1.152:57283 sip:192.168.1.152:57283>.
User-Agent: snom760/8.9.3.80.
Content-Length: 0.
.
#
U 192.168.1.156:5060 -> 192.168.1.152:57283 #59
SIP/2.0 200 OK.
Via: SIP/2.0/UDP 192.168.1.152:57283;rport=57283;received=192.168.1.152.
From: <sip:MAC%3a0004137120D8@lan sip:MAC%3a0004137120D8@lan>;tag=1472545741.
To: <sip:MAC%3a0004137120D8@lan sip:MAC%3a0004137120D8@lan>;tag=fb721cde02dffb6bb099728401306798.1182.
Call-ID: 1886698335@192.168.1.152 mailto:1886698335@192.168.1.152.
CSeq: 1 SUBSCRIBE.
Server: kamailio (5.2.5 (x86_64/linux)).
Content-Length: 0.
.
#
U 172.23.56.1:5060 -> 192.168.1.152:57283 #60
NOTIFY sip:192.168.1.152:57283 sip:192.168.1.152:57283 SIP/2.0.
Via: SIP/2.0/UDP 192.168.1.156:5060;branch=z9hG4bKa0df.967a0433000000000000000000000000.0.
To: <sip:MAC%3a0004137120D8@lan sip:MAC%3a0004137120D8@lan>;tag=1472545741.
From: <MAC%3a0004137120D8>;tag=da567df9df3ac234e43969a051db4641-d106.
CSeq: 10 NOTIFY.
Call-ID: 1886698335@192.168.1.152 mailto:1886698335@192.168.1.152.
Max-Forwards: 70.
Content-Length: 33.
User-Agent: kamailio (5.2.5 (x86_64/linux)).
Subscription-State: terminated;reason=timeout.
Event: ua-profile;profile-type="device";vendor="snom";model="snom760";version="8.9.3.80".
Content-Type: application/url.
.
http://server.conf/settings-%7Bmac%7D http://server.conf/settings-%7Bmac%7D
#
U 172.23.56.1:5060 -> 192.168.1.152:57283 #61
NOTIFY sip:192.168.1.152:57283 sip:192.168.1.152:57283 SIP/2.0.
Via: SIP/2.0/UDP 192.168.1.156:5060;branch=z9hG4bKa0df.967a0433000000000000000000000000.0.
To: <sip:MAC%3a0004137120D8@lan sip:MAC%3a0004137120D8@lan>;tag=1472545741.
From: <MAC%3a0004137120D8>;tag=da567df9df3ac234e43969a051db4641-d106.
CSeq: 10 NOTIFY.
Call-ID: 1886698335@192.168.1.152 mailto:1886698335@192.168.1.152.
Max-Forwards: 70.
Content-Length: 33.
User-Agent: kamailio (5.2.5 (x86_64/linux)).
Subscription-State: terminated;reason=timeout.
Event: ua-profile;profile-type="device";vendor="snom";model="snom760";version="8.9.3.80".
Content-Type: application/url.
.
http://server.conf/settings-%7Bmac%7D http://server.conf/settings-%7Bmac%7D
#
(If I change the IP-parameter to "172.23.56.1" the resulting sending IP is unchanged!)
...
Am 30.03.2020 um 16:17 schrieb Daniel-Constantin Mierla <miconda@gmail.com mailto:miconda@gmail.com>:
Hello,
On 30.03.20 12:07, Jan-Hendrik Dörner wrote:
...
Hallo,
several telephones send a SIP-multicast SUBSCRIBE message to address 224.0.1.75 if they have no settings-URL configured and receive none over DHCP.
So I configure my kamailio server, to respond to that multicast-request.
But: Although mine is working, I do feel it could be improved, since the NOTIFY packet send out is  not quite as it should be …
Here is what I did (the 172.23.56.1 is my voip-vlan-address)
listen=udp:172.23.56.1:5060 advertise 192.168.1.156:5060
listen=udp:192.168.1.156:5060 advertise 192.168.1.156:5060
listen=tcp:127.0.0.1:5060
mcast="eth0"
listen=udp:224.0.1.75:5060
….
if ($Ri == "224.0.1.75"){
       if(is_method("SUBSCRIBE")){
          xlog("L_INFO", "Received pnp-event from IP $si from User-Agent $hdr(User-Agent) und User $fU\r\n" );                                           
          sl_send_reply("200", "OK");                                                                                                                    
          t_uac_send("NOTIFY", "$(ct{s.substr,1,0}{s.striptail,1})", "", "","Subscription-State: terminated;reason=timeout\r\nEvent: $hdr(Event)\r\nContent-Type: application/url\r\nFrom: $fU\r\nTo: $hdr(From)", "http://server.conf/settings-%7Bmac%7D http://server.conf/settings-%7Bmac%7D");
       }else  {                                                                                                                                                                                                                         
         xlog("L_INFO", "Drop message $rm from pnp-Interface \r\n" );
      }                                          
      exit;
   }
And here are the SIP-packets  I see on my server (192.168.1.156) coming from my snom-phone (192.168.1.152).
My problems with the NOTIFY -packets are:

How do I set the Via parameters to be the same as in the OK-reply?

Try to set the next hop address to "$su" and combined with 2) maybe it
results in what you want to get.
...

How do I send out the NOTIFY only via the 192.168.1.156 network interface?

Set the local socket parameter from where to send the NOTIFY.
...

May I send out the NOTIFY with the Call-ID from the SUBSCRIBE message? How?

Provide the Call-Id haeder as part of the headers parameter:

https://www.kamailio.org/docs/modules/stable/modules/tm.html#tm.f.t_uac_send https://www.kamailio.org/docs/modules/stable/modules/tm.html#tm.f.t_uac_send
Cheers,
Daniel
...
Any help is highly appreciated
Jan-Hendrik
#
U 192.168.1.152:58714 -> 224.0.1.75:5060 #258
SUBSCRIBE sip:MAC%3a0004137120D8@lan sip:MAC%3a0004137120D8@lan SIP/2.0.
Via: SIP/2.0/UDP 192.168.1.152:58714;rport.
From: <sip:MAC%3a0004137120D8@lan sip:MAC%3a0004137120D8@lan>;tag=1750588964.
To: <sip:MAC%3a0004137120D8@lan sip:MAC%3a0004137120D8@lan>.
Call-ID: 1395386659@192.168.1.152 mailto:1395386659@192.168.1.152.
CSeq: 1 SUBSCRIBE.
Event: ua-profile;profile-type="device";vendor="snom";model="snom760";version="8.9.3.80".
Expires: 0.
Accept: application/url.
Contact: <sip:192.168.1.152:58714 sip:192.168.1.152:58714>.
User-Agent: snom760/8.9.3.80.
Content-Length: 0.
.
#
U 192.168.1.156:5060 -> 192.168.1.152:58714 #259
SIP/2.0 200 OK.
Via: SIP/2.0/UDP 192.168.1.152:58714;rport=58714;received=192.168.1.152.
From: <sip:MAC%3a0004137120D8@lan sip:MAC%3a0004137120D8@lan>;tag=1750588964.
To: <sip:MAC%3a0004137120D8@lan sip:MAC%3a0004137120D8@lan>;tag=fb721cde02dffb6bb099728401306798.2f00.
Call-ID: 1395386659@192.168.1.152 mailto:1395386659@192.168.1.152.
CSeq: 1 SUBSCRIBE.
Server: kamailio (5.2.5 (x86_64/linux)).
Content-Length: 0.
.
#
U 192.168.1.156:5060 -> 192.168.1.152:58714 #260
NOTIFY sip:192.168.1.152:58714 sip:192.168.1.152:58714 SIP/2.0.
Via: SIP/2.0/UDP 224.0.1.75;branch=z9hG4bKf21c.917eaf36000000000000000000000000.0.
To: <sip:MAC%3a0004137120D8@lan sip:MAC%3a0004137120D8@lan>;tag=1750588964.
From: <MAC%3a0004137120D8>;tag=da567df9df3ac234e43969a051db4641-8cfb.
CSeq: 10 NOTIFY.
Call-ID: 24eaa8de01be1768-70960@172.23.56.1 mailto:24eaa8de01be1768-70960@172.23.56.1.
Max-Forwards: 70.
Content-Length: 33.
User-Agent: kamailio (5.2.5 (x86_64/linux)).
Subscription-State: terminated;reason=timeout.
Event: ua-profile;profile-type="device";vendor="snom";model="snom760";version="8.9.3.80".
Content-Type: application/url.
.
http://server.conf/settings-%7Bmac%7D http://server.conf/settings-%7Bmac%7D
#
U 172.23.56.1:5060 -> 192.168.1.152:58714 #261
NOTIFY sip:192.168.1.152:58714 SIP/2.0.
Via: SIP/2.0/UDP 224.0.1.75;branch=z9hG4bKf21c.917eaf36000000000000000000000000.0.
To: sip:MAC%3a0004137120D8@lan;tag=1750588964.
From: <MAC%3a0004137120D8>;tag=da567df9df3ac234e43969a051db4641-8cfb.
CSeq: 10 NOTIFY.
Call-ID: 24eaa8de01be1768-70960@172.23.56.1.
Max-Forwards: 70.
Content-Length: 33.
User-Agent: kamailio (5.2.5 (x86_64/linux)).
Subscription-State: terminated;reason=timeout.
Event: ua-profile;profile-type="device";vendor="snom";model="snom760";version="8.9.3.80".
Content-Type: application/url.
.
http://server.conf/settings-%7Bmac%7D
#
U 172.23.56.1:5060 -> 192.168.1.152:58714 #262
NOTIFY sip:192.168.1.152:58714 SIP/2.0.
Via: SIP/2.0/UDP 224.0.1.75;branch=z9hG4bKf21c.917eaf36000000000000000000000000.0.
To: sip:MAC%3a0004137120D8@lan;tag=1750588964.
From: <MAC%3a0004137120D8>;tag=da567df9df3ac234e43969a051db4641-8cfb.
CSeq: 10 NOTIFY.
Call-ID: 24eaa8de01be1768-70960@172.23.56.1.
Max-Forwards: 70.
Content-Length: 33.
User-Agent: kamailio (5.2.5 (x86_64/linux)).
Subscription-State: terminated;reason=timeout.
Event: ua-profile;profile-type="device";vendor="snom";model="snom760";version="8.9.3.80".
Content-Type: application/url.
.
http://server.conf/settings-%7Bmac%7D
#
U 192.168.1.152:58714 -> 224.0.1.75:5060 #263
SUBSCRIBE sip:MAC%3a0004137120D8@lan SIP/2.0.
Via: SIP/2.0/UDP 192.168.1.152:58714;rport.
From: sip:MAC%3a0004137120D8@lan;tag=1971605806.
To: sip:MAC%3a0004137120D8@lan.
Call-ID: 1846532696@192.168.1.152.
CSeq: 1 SUBSCRIBE.
Event: ua-profile;profile-type="device";vendor="snom";model="snom760";version="8.9.3.80".
Expires: 0.
Accept: application/url.
Contact: sip:192.168.1.152:58714.
User-Agent: snom760/8.9.3.80.
Content-Length: 0.
.
#
U 192.168.1.156:5060 -> 192.168.1.152:58714 #264
SIP/2.0 200 OK.
Via: SIP/2.0/UDP 192.168.1.152:58714;rport=58714;received=192.168.1.152.
From: sip:MAC%3a0004137120D8@lan;tag=1971605806.
To: sip:MAC%3a0004137120D8@lan;tag=fb721cde02dffb6bb099728401306798.2f00.
Call-ID: 1846532696@192.168.1.152.
CSeq: 1 SUBSCRIBE.
Server: kamailio (5.2.5 (x86_64/linux)).
Content-Length: 0.
.
#
U 192.168.1.156:5060 -> 192.168.1.152:58714 #265
NOTIFY sip:192.168.1.152:58714 SIP/2.0.
Via: SIP/2.0/UDP 224.0.1.75;branch=z9hG4bK201a.063839a4000000000000000000000000.0.
To: sip:MAC%3a0004137120D8@lan;tag=1971605806.
From: <MAC%3a0004137120D8>;tag=da567df9df3ac234e43969a051db4641-f31b.
CSeq: 10 NOTIFY.
Call-ID: 24eaa8de01be1768-70963@172.23.56.1.
Max-Forwards: 70.
Content-Length: 33.
User-Agent: kamailio (5.2.5 (x86_64/linux)).
Subscription-State: terminated;reason=timeout.
Event: ua-profile;profile-type="device";vendor="snom";model="snom760";version="8.9.3.80".
Content-Type: application/url.
.
http://server.conf/settings-%7Bmac%7D
#
U 192.168.1.152:58714 -> 192.168.1.156:5060 #266
SIP/2.0 200 Ok.
Via: SIP/2.0/UDP 224.0.1.75;branch=z9hG4bKf21c.917eaf36000000000000000000000000.0;received=192.168.1.156.
From: MAC:0004137120D8;tag=da567df9df3ac234e43969a051db4641-8cfb.
To: sip:MAC%3A0004137120D8@lan;tag=1750588964.
Call-ID: 24eaa8de01be1768-70960@172.23.56.1.
CSeq: 10 NOTIFY.
User-Agent: snom760/8.9.3.80.
Content-Length: 0.
.
#
U 192.168.1.152:58714 -> 192.168.1.156:5060 #267
SIP/2.0 200 Ok.
Via: SIP/2.0/UDP 224.0.1.75;branch=z9hG4bKf21c.917eaf36000000000000000000000000.0;received=192.168.1.156.
From: MAC:0004137120D8;tag=da567df9df3ac234e43969a051db4641-8cfb.
To: sip:MAC%3A0004137120D8@lan;tag=1750588964.
Call-ID: 24eaa8de01be1768-70960@172.23.56.1.
CSeq: 10 NOTIFY.
User-Agent: snom760/8.9.3.80.
Content-Length: 0.
.
#
U 192.168.1.152:58714 -> 192.168.1.156:5060 #268
SIP/2.0 200 Ok.
Via: SIP/2.0/UDP 224.0.1.75;branch=z9hG4bK201a.063839a4000000000000000000000000.0;received=192.168.1.156.
From: MAC:0004137120D8;tag=da567df9df3ac234e43969a051db4641-f31b.
To: sip:MAC%3A0004137120D8@lan;tag=1971605806.
Call-ID: 24eaa8de01be1768-70963@172.23.56.1.
CSeq: 10 NOTIFY.
User-Agent: snom760/8.9.3.80.
Content-Length: 0.
.

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Re: [SR-Users] How to correctly answer a PnP-SUBSCRIBE message