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Twilio Trunk with TLS + RTSP


Roozbeh
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Has anyone had any success configuring twilio trunk with TLS ? 

I am trying to configure twilio trunk with TLS over port 5061. I have Proxy address configured as below and I have enabled Secure Trunking enabled (TLS must be used to encrypt SIP messages on port 5061, and SRTP must be used to encrypt the media packets. Any non-encrypted calls will be rejected)

once configure, when dialing out I only hear white noise. 

My configuration works with udp transport on port 5060 with secure trunking disabled.  

image.thumb.png.1c109145683caa905184b7088dcb5319.png

 

any help would be appreciated. 

outbound.pcap

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My guess there is a problem with the certificate:

% curl -vv https://techguysio.pstn.umatilla.twilio.com:5061
* Server certificate:
*  subject: C=US; ST=California; L=San Francisco; O=Twilio, Inc.; CN=*.us2.twilio.com
*  start date: Feb 18 00:00:00 2021 GMT
*  expire date: Feb 22 23:59:59 2022 GMT
*  subjectAltName does not match techguysio.pstn.umatilla.twilio.com
* SSL: no alternative certificate subject name matches target host name 'techguysio.pstn.umatilla.twilio.com'
* Closing connection 0
* TLSv1.2 (OUT), TLS alert, close notify (256):
curl: (60) SSL: no alternative certificate subject name matches target host name 'techguysio.pstn.umatilla.twilio.com'
More details here: https://curl.haxx.se/docs/sslcerts.html

curl failed to verify the legitimacy of the server and therefore could not
establish a secure connection to it. To learn more about this situation and
how to fix it, please visit the web page mentioned above.

 

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You are 100% correct, the localized URIs do not have wild card certs *.pstn.umatilla.twilio.com thus failing the handshake. I used the Termination SIP URI and it worked like a charm!

Thank you!!!

I will have to work with twilio to create wild card certs for their *.pstn.umatilla.twilio.com

https://techguysio.pstn.twilio.com:5061

$ curl -vv https://techguysio.pstn.twilio.com:5061
*   Trying 54.172.60.3:5061...
* TCP_NODELAY set
* Connected to techguysio.pstn.twilio.com (54.172.60.3) port 5061 (#0)
* ALPN, offering h2
* ALPN, offering http/1.1
* successfully set certificate verify locations:
*   CAfile: /etc/ssl/certs/ca-certificates.crt
  CApath: /etc/ssl/certs
* TLSv1.3 (OUT), TLS handshake, Client hello (1):
* TLSv1.3 (IN), TLS handshake, Server hello (2):
* TLSv1.2 (IN), TLS handshake, Certificate (11):
* TLSv1.2 (IN), TLS handshake, Server key exchange (12):
* TLSv1.2 (IN), TLS handshake, Server finished (14):
* TLSv1.2 (OUT), TLS handshake, Client key exchange (16):
* TLSv1.2 (OUT), TLS change cipher, Change cipher spec (1):
* TLSv1.2 (OUT), TLS handshake, Finished (20):
* TLSv1.2 (IN), TLS handshake, Finished (20):
* SSL connection using TLSv1.2 / ECDHE-RSA-AES128-GCM-SHA256
* ALPN, server did not agree to a protocol
* Server certificate:
*  subject: C=US; ST=California; L=San Francisco; O=Twilio, Inc.; CN=*.pstn.twilio.com
*  start date: Jul 27 00:00:00 2020 GMT
*  expire date: Sep 29 12:00:00 2021 GMT
*  subjectAltName: host "techguysio.pstn.twilio.com" matched cert's "*.pstn.twilio.com"
*  issuer: C=US; O=DigiCert Inc; OU=www.digicert.com; CN=Thawte RSA CA 2018
*  SSL certificate verify ok.
> GET / HTTP/1.1
> Host: techguysio.pstn.twilio.com:5061
> User-Agent: curl/7.68.0

 

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