Monday, May 13, 2019

Call encryption with, using OBi200 series

On website

  1.  Login
  2. Go to Main Menu -> Account Settings -> Advanced
  3. Encrypted SIP Traffic: Yes.


  1. Login
  2. Go to Service Providers -> ITSP Profile A -> SIP
    ProxyServerPort: 5061 (from 5060)
    ProxyServerTransport: TLS (from UDP)
    RegistrarServerPort: 5061 (from 5060)
    OutboundProxyPort: 5061 (from 5060)
  3. Voice Services -> SP1 Service -> Calling Features
    X_SRTP: Use SRTP Only (from Disable SRTP)


After making the changes, I got an error message when placing a call: The number you dialed **** has not received a response from the service provider.

The reason is that I was using the Local DNS Records feature (System Management -> WAN Settings). According to, to use the encryption feature, one must specify the exact server name with a number at the end. It seems that a local DNS would not work either.

I fixed it by picking and setting up a specific server:
1. Use "ping" to check the latency of the servers listed here:
2. Find a fastest server to you, e.g.


Go to Service Providers -> ITSP Profile A -> SIP

On website

DID Numbers -> Manage DID -> Edit DID
DID Point of Presence:

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