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How to Bring Your Own Carrier into Freshcaller? 


For inbound calls only

  1. Send the list of numbers you want to use in Freshcaller to support@freshcaller.com
  2. Once we receive the numbers, SIP domains will be generated to identify each number.
    For example, if your phone number is "xxx", your SIP address will be sip:user@xxx-sip.twilio.com. The SIP address ensures that the calls are forwarded to Freshcaller. Once received, you can route these calls to your desired agents/team. 

  3. Once you receive the SIP domains, you can send the domains to your carrier to ensure that your carrier forwards the calls to the right domains. 

  4. Also, send the list of IP addresses that your carrier uses to forward the calls. This will be added to our whitelist.
  5. Ensure that your carrier supports G.711/μ-law and G.711/a-law codec for sending calls.


For inbound and outbound calls 


Follow all the steps stated above for routing inbound calls. In addition to that,

  1. Navigate to Admin-> Numbers and click on Manage caller ID
  2. Click on the Add new caller Id option and add the external number as caller ID.
    You will receive a call to verify the phone number. The verification call is mandatory to ensure that the external number belongs to you.
  3. Send the details of SIP URI or IP provided by your carrier for each number to support@freshcaller.com. Typically, carriers provide one or more SIP URIs for a single number. If there are multiple SIP URIs, specify the priority order provided by the carrier with a range of 0 to 65535.



If you currently have a firewall or any network restrictions, ensure that you whitelist the following IPs:

The following list of IP addresses are required to be whitelisted by your carrier to ensure that the calls go through:


North America Virginia Gateways:

Signalling IPs:

54.172.60.0 to 54.172.60.3


Ports: 5060 (UDP/TCP), 5061 (TLS)


Media IPs:

54.172.60.0/23

34.203.250.0/23

Port Range: 10,000 to 20,000 (UDP)


North America Oregon Gateways:

Signalling IPs:

54.244.51.0 to 54.244.51.3

Ports: 5060 (UDP/TCP), 5061 (TLS)


Media IPs:

54.244.51.0/24

Port Range: 10,000 to 20,000 (UDP)


Europe Ireland Gateways:

Signalling IPs:

54.171.127.192 to 54.171.127.195

Ports: 5060 (UDP/TCP), 5061 (TLS)



Media IPs:

54.171.127.192/26

52.215.127.0/24 

Port Range: 10,000 to 20,000 (UDP)


Europe Frankfurt Gateways:

Signalling IPs:

35.156.191.128 to 35.156.191.131

Ports: 5060 (UDP/TCP), 5061 (TLS)


Media IPs:

35.156.191.128/25 

Port Range: 10,000 to 20,000 (UDP) 


Asia Pacific Tokyo Gateways:

Signalling IPs:

54.65.63.192 to 54.65.63.195

Ports: 5060 (UDP/TCP), 5061 (TLS) 


Media IPs:

54.65.63.192/26

Port Range: 10,000 to 20,000 (UDP)


Asia Pacific Singapore Gateways:

Signalling IPs:

54.169.127.128 to 54.169.127.131

Ports: 5060 (UDP/TCP), 5061 (TLS)


Media IPs:

54.169.127.128/26

Port Range: 10,000 to 20,000 (UDP)


Asia Pacific Sydney Gateways:

Signalling IPs:

54.252.254.64 to 54.252.254.67

Ports: 5060 (UDP/TCP), 5061 (TLS)


Media IPs:

54.252.254.64/26

Port Range: 10,000 to 20,000 (UDP) 


South America Sao Paulo Gateways:

Signalling IPs:

177.71.206.192 to 177.71.206.195

Ports: 5060 (UDP/TCP), 5061 (TLS) 


Media IPs:

177.71.206.192/26

Port Range: 10,000 to 20,000 (UDP)


For more information, refer to — https://www.twilio.com/docs/voice/api/sip-interface#sip-connection-technical-specifications


If you face any further problems, we are always around to help you out. Reach out to us at support@freshcaller.com.