Hello!

(in the previous posting I accidentally used HTML, sorry about that)

I tried to set up Blink as SIP phone on a public IP address, without a SIP proxy. Forwarded all needed ports, and then more. Also, all proper SRV records for my domain are set.

However, when trying to connect from a external SIP client (LinPhone on Android), I immediately receive the message “User hasn’t been found”. Logs (attached) show that Blink receives an INVITE request, then responds with 404 Not Found.

How I can set up Blink so it would accept such requests?

I know this is highly non-standard, but this was the initial goal behind the SIP protocol, wasn’t it?

Thank you in advance!
Piotr Różański
2022-07-07 10:05:07.001868 [blink 6353]: RECEIVED: Packet 1, +0:00:07.807114
31.61.163.76:15235 -(SIP over UDP)-> 192.168.0.87:5060
INVITE sip:[email protected] SIP/2.0
Via: SIP/2.0/UDP 10.88.232.5:39284;branch=z9hG4bK.tWHYegcM~;rport
From: "IPFon" <sip:[email protected]>;tag=yyQK13zHP
To: sip:[email protected]
CSeq: 20 INVITE
Call-ID: Fxn0m8EpA0
Max-Forwards: 70
Supported: replaces, outbound, gruu
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY, MESSAGE, SUBSCRIBE, 
INFO, PRACK, UPDATE
Content-Type: application/sdp
Content-Length: 523
Contact: 
<sip:[email protected]:15235;transport=udp>;q=0;expires=3600;+sip.instance="<urn:uuid:e84f2369-e1c0-0004-a7e6-ad55bc5a7fd4>"
User-Agent: LinphoneAndroid/4.6.11 (G8441) LinphoneSDK/5.1.46 (tags/5.1.46^0)

v=0
o=ptrdbiuro001 135 1373 IN IP4 10.88.232.5
s=Talk
c=IN IP4 10.88.232.5
t=0 0
a=rtcp-xr:rcvr-rtt=all:10000 stat-summary=loss,dup,jitt,TTL voip-metrics
m=audio 7078 RTP/AVP 96 97 98 0 8 18 99 100 101
a=rtpmap:96 opus/48000/2
a=fmtp:96 useinbandfec=1
a=rtpmap:97 speex/16000
a=fmtp:97 vbr=on
a=rtpmap:98 speex/8000
a=fmtp:98 vbr=on
a=fmtp:18 annexb=yes
a=rtpmap:99 telephone-event/48000
a=rtpmap:100 telephone-event/16000
a=rtpmap:101 telephone-event/8000
a=rtcp-fb:* trr-int 1000
a=rtcp-fb:* ccm tmmbr

--
2022-07-07 10:05:07.087376 [blink 6353]: SENDING: Packet 2, +0:00:07.892622
192.168.0.87:5060 -(SIP over UDP)-> 31.61.163.76:15235
SIP/2.0 404 Not Found
Via: SIP/2.0/UDP 
10.88.232.5:39284;rport=15235;received=31.61.163.76;branch=z9hG4bK.tWHYegcM~
Call-ID: Fxn0m8EpA0
From: "IPFon" <sip:[email protected]>;tag=yyQK13zHP
To: <sip:[email protected]>;tag=e1e5c317-da30-4fc9-ba8d-6625b9ce7d56
CSeq: 20 INVITE
Server: Blink 5.2.0 (Linux)
Content-Length:  0


--
2022-07-07 10:05:07.087556 [blink 6353]: RECEIVED: Packet 3, +0:00:07.892802
31.61.163.76:15235 -(SIP over UDP)-> 192.168.0.87:5060
ACK sip:[email protected] SIP/2.0
Via: SIP/2.0/UDP 10.88.232.5:39284;branch=z9hG4bK.tWHYegcM~;rport
Call-ID: Fxn0m8EpA0
From: "IPFon" <sip:[email protected]>;tag=yyQK13zHP
To: <sip:[email protected]>;tag=e1e5c317-da30-4fc9-ba8d-6625b9ce7d56
Contact: 
<sip:[email protected]:15235;transport=udp>;q=0;expires=3600;+sip.instance="<urn:uuid:e84f2369-e1c0-0004-a7e6-ad55bc5a7fd4>"
Max-Forwards: 70
CSeq: 20 ACK


--
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