Sip Trunking

SIP trunking Basics:

• In a general sense, SIP trunking is an application layer-based protocol that enables individuals to make calls and other interactions over the IP network to a Telephone System.
  • Sip Trunking can be utilized on both Digital and VoIP Telephone systems.
• SIP trunking are also incorporating unified communications into their collaborative strategies.

Certified Phone System Manufacturers:

Registered & Tested Phone System Manufacturers:

Basic SIP Trunk Troubleshooting:

Unable to Connect to the SIP Switch:

1. Check your Internet Connection.
   1. If your Internet Service Provider (ISP) is experiencing a service interruption, your SIP Services will not work as well.
      1. Contact your Internet Service Provider (ISP) for support.
   2. Ironton DSL customers:
      1. Refer to - "DSL Service Support".
2. Check the connections to the Phone System.
   1. Make sure the Patch Cable is securely connected to the Phone System.
   2. Unable to obtain an IP address on the internal network.
      1. Contact your Phone System Vendor.
      2. Contact your IT professional to check the internal network and Firewall Settings.
      3. Proceed to Step 3.
3. Bypass the Internal Network.
   1. Plug the Phone System directly into Internet Service Provider's (ISP) (cable or DSL) modem.
   2. If the Phone System obtains an IP address and registers, there is an issue with the sites internal network.
      1. Contact your IT professional to troubleshoot and repair the Internal Network Eguipment.
   3. If the Phone System does not obtain an IP address.
      1. Contact your Phone System Vendor.
      2. Contact your ISP to troubleshoot the Internet connection.
   4. If the Phone System obtains an IP address and does not register.
      1. Refer to - Registration Issues.
      2. Contact Ironton Technical Support if required.

Verify Phone Number Settings:

1. Is the phone number a Registered account ID or Alias (DID) under a registered account?
   1. Registered account ID:
      1. Is the Account ID a registered number to the phone system?
         1. Refer to - Registration Issues.
      2. Is the Account ID forwarded to another Account?
         1. Verify the account the number is forwarded to.
      3. Is the Account ID forwarded to a SIP URI?
         1. Verify the IP address the number is forwarded to.
   2. Alias:
      1. Is the Alias a standard DID.
         1. The Phone System controls the routing of the calls once delivered to the Account ID.
         2. Verify the phone system's routing.
            1. Contact the phone system vendor if required.
      2. or does the Alias Allow Authentication / Registration?
         1. Verify the number is registered to the SIP Switch.
            1. Refer to - Registration Issues.
2. Verify the phone system is receiving inbound calls from the trunk.
   1. Contact the phone system vendor if required.
   2. Contact your IP professional if required.
   3. Technical Support will be able to supply where the call was delivered.
3. Verify the phone system is sending outbound calls to the trunk.
   1. Contact the phone system vendor if required.
   2. Contact your IP professional if required.
   3. Technical Support will be able to supply where the call was delivered.

Registration Issues:

1. Verify the site has internet services.
   1. If you are not able to access the internet.
      1. Contact your IT Professional to troubleshoot.
      2. or Contact your ISP to troubleshoot.
2. Verify Firewall & Router settings.
   1. Disable SIPALG.
3. Verify Authentication Settings.
   • Authentication provided in welcome letter.
     • Contact Ironton Technical support for verification if required.
     • Must be performed by the Accounts Authorized Contact.
   • Registration Credentials can also be found in the Web Self-care.
     • ITC Account Self-care Interface
     • ITC Customer Self-care Interface
   1. Account ID.
   2. Service Password.
      1. Password is case sensitive.
4. Verify SIP Server Settings.
   1. Certified System Vendors:
      1. Consult the Manufacturer for Interop Documentation.
   2. Phone System Setup Guides:
      1. 2015 Allworx Setup Guide
      2. 2015 FreePBX Configuration Guide
      3. 2017 Yeaster Configuration Guide
      4. Zultys IG Setup Guide
         1. Zultys Re-register Correction
   3. SIP Servers:
      1. Domain Registration:
         1. sip.itcgn.com
      2. IP Registration:
         1. 204.186.16.116
         2. 204.186.16.118
   4. Port:
      1. 5060
   5. Outbound Proxy Server (if required):
      1. Same as SIP Server
   6. Transport:
      1. UDP