Posted on by patrickmarcpreuss

Telekom SIP

As a personal Note the German Telekom SIP settings

SIP-ID/Benutzer:Ihre Telefonnummer
Bildschirmname (falls vorhanden):Ihre Telefonnummer
Authentifizierungsname/Benutzername:Ihre E-Mail-Adresse, z. B. ihr-name@t-online.de
Passwort:Ihr Passwort
SIP-Proxy:tel.t-online.de
Registrar:tel.t-online.de
Realm:tel.t-online.de
STUN-Server:stun.t-online.de
Outbound-Proxy:
leer lassen oder ebenfalls tel.t-online.de

Gigaset

https://service.gigaset.com/de/support/solutions/articles/75000035447-dns-srv-lookup

There is no A record for tel.t-online.de

# dig @ns1.edns.t-ipnet.de tel.t-online.de

; <<>> DiG 9.18.12-1-Debian <<>> @ns1.edns.t-ipnet.de tel.t-online.de
; (2 servers found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 51958
;; flags: qr aa rd; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1
;; WARNING: recursion requested but not available

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1232
;; QUESTION SECTION:
;tel.t-online.de.               IN      A

;; AUTHORITY SECTION:
tel.t-online.de.        10800   IN      SOA     ns1.edns.t-ipnet.de. hostmaster.t-ipnet.net. 2018022700 43200 1800 1209600 21600

;; Query time: 16 msec
;; SERVER: 212.185.255.209#53(ns1.edns.t-ipnet.de) (UDP)
;; WHEN: Wed Oct 04 07:38:23 CEST 2023
;; MSG SIZE  rcvd: 119

But there are NAPTR records 

dig @ns1.edns.t-ipnet.de -t ANY tel.t-online.de

; <<>> DiG 9.18.12-1-Debian <<>> @ns1.edns.t-ipnet.de -t ANY tel.t-online.de
; (2 servers found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 33516
;; flags: qr aa rd; QUERY: 1, ANSWER: 10, AUTHORITY: 0, ADDITIONAL: 1
;; WARNING: recursion requested but not available

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1232
;; QUESTION SECTION:
;tel.t-online.de.               IN      ANY

;; ANSWER SECTION:
tel.t-online.de.        10800   IN      NS      ns1.edns.t-ipnet.de.
tel.t-online.de.        10800   IN      NS      ns2.edns.t-ipnet.de.
tel.t-online.de.        10800   IN      NS      ns3.edns.t-ipnet.de.
tel.t-online.de.        10800   IN      NS      ns4.edns.t-ipnet.de.
tel.t-online.de.        10800   IN      NS      ns5.edns.t-ipnet.de.
tel.t-online.de.        10800   IN      NS      ns6.edns.t-ipnet.de.
tel.t-online.de.        7200    IN      NAPTR   10 0 "s" "SIPS+D2T" "" _sips._tcp.tel.t-online.de.
tel.t-online.de.        7200    IN      NAPTR   20 0 "s" "SIP+D2U" "" _sip._udp.tel.t-online.de.
tel.t-online.de.        7200    IN      NAPTR   30 0 "s" "SIP+D2T" "" _sip._tcp.tel.t-online.de.
tel.t-online.de.        10800   IN      SOA     ns1.edns.t-ipnet.de. hostmaster.t-ipnet.net. 2018022700 43200 1800 1209600 21600

;; Query time: 16 msec
;; SERVER: 212.185.255.209#53(ns1.edns.t-ipnet.de) (TCP)
;; WHEN: Wed Oct 04 07:40:37 CEST 2023
;; MSG SIZE  rcvd: 387


; <<>> DiG 9.16.23-RH <<>> @ns1.edns.t-ipnet.de. -t SRV _sip._udp.tel.t-online.de
; (2 servers found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 9466
;; flags: qr aa rd; QUERY: 1, ANSWER: 3, AUTHORITY: 0, ADDITIONAL: 1
;; WARNING: recursion requested but not available

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1232
;; QUESTION SECTION:
;_sip._udp.tel.t-online.de.     IN      SRV

;; ANSWER SECTION:
_sip._udp.tel.t-online.de. 3600 IN      SRV     30 0 5060 h2-epp-100.edns.t-ipnet.de.
_sip._udp.tel.t-online.de. 3600 IN      SRV     10 0 5060 mue000-l01-mav-pc-rt-001.edns.t-ipnet.de.
_sip._udp.tel.t-online.de. 3600 IN      SRV     20 0 5060 d-epp-100.edns.t-ipnet.de.

;; Query time: 18 msec
;; SERVER: 212.185.255.209#53(212.185.255.209)
;; WHEN: Wed Oct 04 07:40:40 UTC 2023
;; MSG SIZE  rcvd: 205

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