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7.10 Configuring SIP Response Codes for Alternative Routing
Reasons
This section describes configuring the SBC's handling of SIP error responses received from Zoom
Phone Cloud system for outgoing SIP dialog-initiating methods (e.g., INVITE, OPTIONS, and
SUBSCRIBE messages). In this case, the SBC attempts to locate an alternative route for the call. This
feature works together with the Proxy Hot Swap feature, which is configured in the Proxy Sets table.
Alternative routing based on SIP responses is configured using two tables with 'parent-child'
relationships:
◼ Alternative Reasons Set table ('parent'): Defines the name of the Alternative Reasons Set.
◼ Alternative Reasons Rules table ('child'): Defines SIP response codes per Alternative Reasons
Set.
To apply your configured alternative routing reason rules, you need to assign the Alternative Reasons
Set for which you configured the rules, to the Zoom Phone Cloud system IP Group in the IP Groups
table, using the 'SBC Alternative Routing Reasons Set' parameter.
To configure SIP reason codes for alternative IP routing:
1. Open the Alternative Routing Reasons table (Setup menu > Signaling & Media tab > SBC
folder > Routing > Alternative Reasons Set).
2. Click New and configure a name for the Alternative Routing Reasons Set (e.g., Alt. Route
Reasons).
3. Click Apply.
4. Select the index row of the Alternative Reasons Set that you added, and click the Alternative
Reasons Rules link located at the bottom of the page; the Alternative Reasons Rules table
opens.
5. Click New and select 503 Service Unavailable from the 'Release Cause Code' drop-down list.
6. Click Apply.
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