General SIP Settings

Keeping your Equipment Secure

Although we don't provide support with the setup of your SIP server/PBX, We provide you the settings you will need below for your supplier to be able to instruct on completing the setup.

It's important to secure your server/PBX with strong passwords. Your Server/PBX maintainer will usually have this covered, however if not, you can follow this advice on setting strong passwords:

  • Be at least 8 characters long, recommended at 12+ characters
  • Use of letters and numbers
  • Contain both capital and lower-case letters
  • Include special characters. E.g. "@, £, $, %"
  • Regularly change your PBX password

Should you need further advice on keeping your Server/PBX secure, please contact the maintainer to ensure you are protected.

Further information on securing your PBX can be found on the Comms Council website here.

Additionally, should you need any of your Zen SIP Trunking details, you can find these within the Customer Portal.

  • Provider Name - Zen Internet
  • Country - UK
  • Proxy or B2BUA, Media handling interface specification - Proprietary proxy
  • SIP URI - voip.zen.co.uk
  • Port - 5060
  • Re-registration Interval at Provider (seconds) - up to 900
  • Use Proxy? - Yes
  • Use STUN - No

Your firewall and network configuration needs to allow inbound and outbound traffic for the Ports and IP addresses listed below:

Signaling Addresses

Used for setup, initiation, management and termination of calls.

  • Port - 5060 UDP
  • IP address - 212.23.7.228
Media Call Audio Addresses
  • Ports - 20000 to 30000 UDP
  • IP Addresses:
    • 62.3.88.0/28 and 62.3.88.16/28 or enter the addresses from 62.3.88.0 to 62.3.88.31 (inclusive) if your network equipment does not support representing IP ranges using CIDR
  • UDP - Yes Port 5060
  • TCP - No
  • TLS - No
  • IPsec Tunnel - No
  • G.711 a-law - Yes Sample rate 20ms
  • G.711 -law - Yes Sample rate 20ms
  • G.729A - No
  • G.729A/B - No
  • Fax G.711 Based Fax - Yes
  • Fax T.38 - No
  • RFC2833 - Yes
  • Inband - Yes
  • INFO - No
  • Authentication - Digest Authentication
  • Proxy or B2BUA, Media Handling - B2BUA
  • Forking - Yes
  • Transfer with REFER - No
Carbon Neutral
Phone | Zen Internet
Zen Internet - Home SalesSales
01706 902573
Phone | Zen Internet
Zen Internet - Customer EnquiriesCustomer Enquiries
01706 902001