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Information to Know Before Starting

This Technical Bulletin is based on the SBC SIP Trunking Configuration - Sentinel in the LAN configuration note published on the Media5 Documentation Portal and is to be used as a supplementary guide. Please make sure that you have followed all the steps described in the SBC SIP Trunking Configuration - Sentinel in the LAN, before following this guide.
IMPORTANT:
If you are not familiar with the meaning of the fields and buttons, click Show Help, located at the upper right corner of the Web page. When activated, the fields and buttons that offer online help will change to green and if you hover over them, the description will bedisplayed.
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Dual Trunk Survivability

This scenario describes how to configure a Sentinel, so that calls failover to the Secondary SIP Server / ITSP when the Primary SIP service provider is unreachable.

  • The Sentinel unit is located in the LAN, behind a Near-End NAT.
  • Only port ETH1 is used.
  • The Sentinel unit is set as a Demarcation point.
  • The Sentinel unit may or may not register to the SIP service provider.
  • The Sentinel unit is polling/monitoring both Service Providers to ensure they are reachable.
  • When the Main/Primary SIP Provider gets unreachable, calls go through the Secondary SIP service Provider.
  • During failover scenarios, when the Main/Primary SIP Provider gets reachable again, calls are falling back to the Main/Primary service Provider.
  • For more details on the Sbc service, refer to the Sbc service guide published on the Media5 documentation portal at https://documentation.media5corp.com


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Configuring Black listing in the wan_ip_trunk_ca Call Agent

Steps
  1. Go to SBC/Configuration.
  2. In the Call Agent Configuration table, click next to wan_ip_trunk_ca.
  3. In the Configure Call Agent table, set the Keep-Alive Interval field to 30.
  4. Set the Blacklisting Duration to 60.
  5. In the Blacklisting Error Codes field, enter the SIP codes (comma-separated) that will make the Sentinel mark the SIP server as unreachable.
  6. Click Save.
  7. Click Apply.
Result
At the top of the screen, No will be displayed in the Configuration Modified field, indicating that the configuration that was modified is now applied to the system. When the Sentinel will use the selected Call Agent for a communication, the selected parameters will be applied.

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Configuring the secondary_ip_trunk_ca Call Agent

Steps
  1. Go to SBC/Configuration.
  2. Select the Enable check box, located next to secondary_ip_trunk_ca.
  3. In the Call Agent Configuration table, click next to secondary_ip_trunk_ca.
  4. In the Configure Call Agent table, complete the following fields:
    1. From the Signaling Interface selection list, select uplink_s.
    2. From the Media Interface selection list, select uplink_m.
    3. Set the Peer Host to the IP address of the secondary service provider server or FQDN.
  5. Set the Keep-Alive Interval field to 30.
  6. Set the Blacklisting Duration to 60.
  7. In the Blacklisting Error Codes field, enter the SIP codes (comma-separated) that will make the Sentinel mark the Secondary SIP server as unreachable.
  8. In the Call Agent Rulesets table, click .
    Note:
    Ignore the Invalid configuration and Unknown ruleset warnings, as they will disappear when the configuration is saved.
  9. From the Name selection list, choose automatic_media_relay.
  10. If your Secondary SIP trunk requires authentication, click .
  11. From the Name selection list, choose topology_hiding_out .
  12. If your Secondary SIP trunk requires authentication, click .
  13. In the Name selection list, choose uac_authentication_out.
  14. In the Parameters field, enter USERNAME=Trunk_username PASSWORD=Trunk_password corresponding to the username and password used for authentication.
    Note:
    The parameters are case sensitive and are separated by a space.
  15. Click Save.
  16. Click Apply to apply all changes to the configuration.
Result
No will be displayed in the Config.Modified field, indicating that the configuration that was modified is now applied to the system. When the Mediatrix SBC will use the selected Call Agent for a communication, the selected parameters will be applied.

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Configuring a Registration Agent for the Secondary Sip Server (Optional)

Steps
  1. Go to SBC/Registration.
  2. In the Registration Agent Configuration table, click .
    Note:
    A new line of fields is added.
  3. Complete the User Name enter the username required by your Secondary provider to register your SIP trunk.
    Note:
    If the Secondary provider also requires a password, the information needs to match the parameters in uac_authentication_out in the Configuring the secondary_ip_trunk_ca Call Agent section.
  4. The Friendly Name field is usually left empty.
  5. In the Domain field, enter the IP address or FQDN of your Secondary SIP registrar. Generally the same as defined in Configuring the secondary_ip_trunk_ca Call Agent .
  6. In the Contact field, enter sip:myCONTACT@%capubip(secondary_ip_trunk_ca)% ..
    Note:
    Depending on your provider, myCONTACT must be replaced by either the SIP account username or DID (telephone number).
    Note:
    %capubip(secondary_ip_trunk_ca)% is a macro, which will be automatically replaced by the IP address of the external public IP address as defined in Configuring the uplink_s Signaling Interface section of the SBC SIP Trunking Configuration document.
  7. From the Registration Type selection list, make sure Normal is selected.
  8. Click Apply.
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Importing Rulesets

Before you begin
Rulesets must be imported. The latest Ruleset package can be found on the https://media5.secure.force.com/supportportal (you will be required to supply a user name and password). In the Downloads tab, choose SBC Updated Rulesets, then download the zip file and extract it to your PC.
Context
Steps
  1. Go to Management/File.
    Note:
    The next step is only required if you are not using a secure connexion to access the Management Interface (http://).
  2. Click Activate unsecure file importation from the Web browser.
  3. From the Path field, select sbc/rulesets/.
  4. Click Browse, and navigate to the secondary_ip_trunk_to_lan_pbx_dm.rrs routing ruleset.
  5. Click Import.
Result
The imported Ruleset will appear in the Internal files table, with the selected path in front of the name. The Ruleset will be available in the tables of the SBC/Rulesets page.

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Associating Routing Rulesets to Your Configuration

Steps
  1. Go to SBC/Configuration
  2. In the Routing Rulesets table, from the Name selection list, replace the lan_pbx_to_wan_ip_trunk_dm with the lan_pbx_to_wan_ip_trunk_failover_to_second_dm ruleset.
  3. Click .
  4. From the Name selection list,
    1. Replace registration_to_wan_ip_trunk ruleset with
    2. registration_to_wan_ip_trunk_failover_to_second .
  5. Click .
  6. From the Name selection list, select secondary_ip_trunk_to_lan_pbx.
  7. Click Save.
  8. Click Apply to apply all changes to the configuration.
Result


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Online Help

If you are not familiar with the meaning of the fields and buttons, click Show Help, located at the upper right corner of the Web page. When activated, the fields and buttons that offer online help will change to green and if you hover over them, the description will bedisplayed.

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Copyright Notice

Copyright © 2026 Media5 Corporation.

This document contains information that is proprietary to Media5 Corporation.

Media5 Corporation reserves all rights to this document as well as to the Intellectual Property of the document and the technology and know-how that it includes and represents.

This publication cannot be reproduced, neither in whole nor in part, in any form whatsoever, without written prior approval by Media5 Corporation.

Media5 Corporation reserves the right to revise this publication and make changes at any time and without the obligation to notify any person and/or entity of such revisions and/or changes.