Callcentric

Callcentric is a commercial SIP service that supports 10 digit US phone numbers and PSTN origination and termination. It supports ZRTP but not encrypted SIP. The unencrypted SIP network is large and robust. At the time of this writing there are 10 servers online.

Network scan results:

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lee@ikaruga:~$ dig SRV _sip._udp.callcentric.com

; <<>> DiG 9.7.3 <<>> SRV _sip._udp.callcentric.com
;; global options: +cmd
;; Got answer:
;; >>HEADER<< opcode: QUERY, status: NOERROR, id: 30375
;; flags: qr rd ra; QUERY: 1, ANSWER: 9, AUTHORITY: 3, ADDITIONAL: 1

;; QUESTION SECTION:
;_sip._udp.callcentric.com. IN SRV

;; ANSWER SECTION:
_sip._udp.callcentric.com. 576 IN SRV 20 0 5080 alpha4.callcentric.com.
_sip._udp.callcentric.com. 576 IN SRV 20 0 5080 alpha5.callcentric.com.
_sip._udp.callcentric.com. 576 IN SRV 20 0 5080 alpha6.callcentric.com.
_sip._udp.callcentric.com. 576 IN SRV 20 0 5080 alpha7.callcentric.com.
_sip._udp.callcentric.com. 576 IN SRV 20 0 5080 alpha8.callcentric.com.
_sip._udp.callcentric.com. 576 IN SRV 20 0 5080 alpha9.callcentric.com.
_sip._udp.callcentric.com. 576 IN SRV 20 0 5080 alpha1.callcentric.com.
_sip._udp.callcentric.com. 576 IN SRV 20 0 5080 alpha2.callcentric.com.
_sip._udp.callcentric.com. 576 IN SRV 20 0 5080 alpha3.callcentric.com.

;; AUTHORITY SECTION:
callcentric.com. 596 IN NS ns1.telengy.net.
callcentric.com. 596 IN NS ns3.telengy.net.
callcentric.com. 596 IN NS ns2.telengy.net.

;; ADDITIONAL SECTION:
alpha1.callcentric.com. 536 IN A 204.11.192.22

lee@ikaruga:~$ dig SRV _sip-tls._tcp.callcentric.com

; <<>> DiG 9.7.3 <<>> SRV _sip-tls._tcp.callcentric.com
;; global options: +cmd
;; Got answer:
;; >>HEADER<< opcode: QUERY, status: NXDOMAIN, id: 56964
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0

;; QUESTION SECTION:
;_sip-tls._tcp.callcentric.com. IN SRV

;; AUTHORITY SECTION:
callcentric.com. 600 IN SOA ns1.telengy.net. admin.telengy.net. 2012030801 1800 600 864000 600

lee@ikaruga:~$ dig SRV _sips._tcp.callcentric.com

; <<>> DiG 9.7.3 <<>> SRV _sips._tcp.callcentric.com
;; global options: +cmd
;; Got answer:
;; >>HEADER<< opcode: QUERY, status: NXDOMAIN, id: 61004
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0

;; QUESTION SECTION:
;_sips._tcp.callcentric.com. IN SRV

;; AUTHORITY SECTION:
callcentric.com. 600 IN SOA ns1.telengy.net. admin.telengy.net. 2012030801 1800 600 864000 600

lee@ikaruga:~$ nmap alpha1.callcentric.com

Starting Nmap 5.21 ( http://nmap.org ) at 2012-03-09 15:10 PST
Nmap scan report for alpha1.callcentric.com (204.11.192.22)
Host is up (0.089s latency).
Not shown: 999 filtered ports
PORT STATE SERVICE
80/tcp closed http
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