Hi, I'm trying to investigate why my PhonerLite not works with Telnyx for incoming calls (outbound are OK) via SRTP.
I tried different internet providers, checked that firewall not blocks 5060-5062 ports, added STUN server of Telnyx to bypass provider's NAT. Telnyx support says they are receiving 480 so redirect all my calls to voicemail. Why PhonerLite sends 480? Looks like it's properly registered:


11:50:47,700: R: 185.246.41.140:5061 (TLS)
SIP/2.0 200 OK
Via: SIP/2.0/TLS rt=28794
From: "Arthur" <sip:mylogin@sip.telnyx.eu:5061>;tag=3460273390
To: "Arthur" <sip:mylogin@sip.telnyx.eu:5061>;tag=fdf59d86ff7bd8df121baf9155104497.54c80000
Call-ID: AAAA40CD-1973-EE11-83F4-85EE2A73AAAA@m.y.i.p
CSeq: 10 REGISTER
Contact: instance="<urn:uuid:805B2274-114B-EE11-88D1-7200877168FA>"
Server: Telnyx Registrar
Content-Length: 0


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11:56:58,435: R: 185.246.41.140:5061 (TLS)
INVITE sip:+1**********@m.y.i.p:4576;transport=tls SIP/2.0
Record-Route: <sip:185.246.41.140:5061;transport=tls;r2=on;lr;ftag=XKByty905DH6F>
Record-Route: <sip:10.31.224.10:5061;transport=tls;r2=on;lr;ftag=XKByty905DH6F>
Record-Route: <sip:10.31.9.8:6051;transport=tls;r2=on;lr;tnx=9e3.6d2>
Record-Route: <sip:10.31.9.8:6050;r2=on;lr;tnx=9e3.6d2>
Via: SIP/2.0/TLS 4
Via: SIP/2.0/TLS 
Via: SIP/2.0/UDP 10.31.21.24:6000;received=10.31.21.24;rport=6000;branch=z9hG4bK36B74NUm5H7HF
Max-Forwards: 25
From: "+1++++++++++" <sip:+1++++++++++@sip.telnyx.eu>;tag=XKByty905DH6F
To: <sip:+1**********@10.31.9.8>
Call-ID: 65135a3f-6f1b-4262-87d7-40b722780aa4
CSeq: 74646516 INVITE
Contact: <sip:telnyx*mod_sofia**10.31.21.24*6000*@telnyx.com>
Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, REFER, NOTIFY
Supported: timer, path, 100rel
Allow-Events: talk, hold, conference, refer
Privacy: none
Content-Type: multipart/mixed;boundary=890527a2-4796-426c-bf58-e7a714a6e9c6
Content-Length: 1623
X-Telnyx-Session-ID: 2a71f91a-74af-11ee-b7ac-02420a1f0a69
X-Telnyx-Leg-ID: 2a78a9f4-74af-11ee-aaab-02420a1f0a69
P-Asserted-Identity: "+1++++++++++" <sip:+1++++++++++@sip.telnyx.com;verstat=No-TN-Validation>

--890527a2-4796-426c-bf58-e7a714a6e9c6
Content-Type: application/isup
Content-Length: 43



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7s
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11:56:58,435: T: 185.246.41.140:5061 (TLS)
SIP/2.0 480 Temporarily Unavailable
Via: SIP/2.0/TLS 4
Via: SIP/2.0/TLS 
Via: SIP/2.0/UDP 10.31.21.24:6000;received=10.31.21.24;rport=6000;branch=z9hG4bK36B74NUm5H7HF
Record-Route: <sip:185.246.41.140:5061;transport=tls;r2=on;lr;ftag=XKByty905DH6F>
Record-Route: <sip:10.31.224.10:5061;transport=tls;r2=on;lr;ftag=XKByty905DH6F>
Record-Route: <sip:10.31.9.8:6051;transport=tls;r2=on;lr;tnx=9e3.6d2>
Record-Route: <sip:10.31.9.8:6050;r2=on;lr;tnx=9e3.6d2>
From: "+1++++++++++" <sip:+1++++++++++@sip.telnyx.eu>;tag=XKByty905DH6F
To: <sip:+1**********@10.31.9.8>;tag=0091e6d51c73ee1183fc85ee2a73a60f
Call-ID: 65135a3f-6f1b-4262-87d7-40b722780aa4
CSeq: 74646516 INVITE
Contact: <sip:+1**********@m.y.i.p:5062;transport=tls>
Allow: INVITE, ACK, BYE, CANCEL, INFO, MESSAGE, NOTIFY, OPTIONS, REFER, UPDATE, PRACK
Server: PhonerLite/3.22
Content-Length: 0

done

sent pcap

This checkbox is not translated to English and I don't know Deutsch.
Yes, it works now.

To anyone who may google this thread via "telnyx" -

SIP Connection Options -> INBOUND -> Destination Number Format (DNIS) -> select SIP Username

Otherwise Telnyx sends your number in SIP url before "@", not your login. And this triggers PhonerLite filtration.