[SR-Users] How to correctly answer a PnP-SUBSCRIBE message
Daniel-Constantin Mierla
miconda at gmail.com
Mon Mar 30 16:17:41 CEST 2020
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-{mac}");
> }else {
> xlog("L_INFO", "Drop message $rm from pnp-Interface \r\n" );
> }
> exit;
> }
>
>
> And here are the SIP-packets I see on my server (192.168.1.156) coming from my snom-phone (192.168.1.152).
> My problems with the NOTIFY -packets are:
> 1) How do I set the Via parameters to be the same as in the OK-reply?
Try to set the next hop address to "$su" and combined with 2) maybe it
results in what you want to get.
> 2) 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.
> 3) 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
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 at lan SIP/2.0.
> Via: SIP/2.0/UDP 192.168.1.152:58714;rport.
> From: <sip:MAC%3a0004137120D8 at lan>;tag=1750588964.
> To: <sip:MAC%3a0004137120D8 at lan>.
> Call-ID: 1395386659 at 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 #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 at lan>;tag=1750588964.
> To: <sip:MAC%3a0004137120D8 at lan>;tag=fb721cde02dffb6bb099728401306798.2f00.
> Call-ID: 1395386659 at 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/2.0.
> Via: SIP/2.0/UDP 224.0.1.75;branch=z9hG4bKf21c.917eaf36000000000000000000000000.0.
> To: <sip:MAC%3a0004137120D8 at lan>;tag=1750588964.
> From: <MAC%3a0004137120D8>;tag=da567df9df3ac234e43969a051db4641-8cfb.
> CSeq: 10 NOTIFY.
> Call-ID: 24eaa8de01be1768-70960 at 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-{mac}
> #
> 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 at lan>;tag=1750588964.
> From: <MAC%3a0004137120D8>;tag=da567df9df3ac234e43969a051db4641-8cfb.
> CSeq: 10 NOTIFY.
> Call-ID: 24eaa8de01be1768-70960 at 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-{mac}
> #
> 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 at lan>;tag=1750588964.
> From: <MAC%3a0004137120D8>;tag=da567df9df3ac234e43969a051db4641-8cfb.
> CSeq: 10 NOTIFY.
> Call-ID: 24eaa8de01be1768-70960 at 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-{mac}
> #
> U 192.168.1.152:58714 -> 224.0.1.75:5060 #263
> SUBSCRIBE sip:MAC%3a0004137120D8 at lan SIP/2.0.
> Via: SIP/2.0/UDP 192.168.1.152:58714;rport.
> From: <sip:MAC%3a0004137120D8 at lan>;tag=1971605806.
> To: <sip:MAC%3a0004137120D8 at lan>.
> Call-ID: 1846532696 at 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 at lan>;tag=1971605806.
> To: <sip:MAC%3a0004137120D8 at lan>;tag=fb721cde02dffb6bb099728401306798.2f00.
> Call-ID: 1846532696 at 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 at lan>;tag=1971605806.
> From: <MAC%3a0004137120D8>;tag=da567df9df3ac234e43969a051db4641-f31b.
> CSeq: 10 NOTIFY.
> Call-ID: 24eaa8de01be1768-70963 at 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-{mac}
> #
> 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 at lan>;tag=1750588964.
> Call-ID: 24eaa8de01be1768-70960 at 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 at lan>;tag=1750588964.
> Call-ID: 24eaa8de01be1768-70960 at 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 at lan>;tag=1971605806.
> Call-ID: 24eaa8de01be1768-70963 at 172.23.56.1.
> CSeq: 10 NOTIFY.
> User-Agent: snom760/8.9.3.80.
> Content-Length: 0.
> .
>
>
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--
Daniel-Constantin Mierla -- www.asipto.com
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