Howto:SIP redundancy / failover
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Overview
Often scenarios are needed in which a reliability of the SIP connection is to be realized. There are several approaches and scenarios for SIP redundancy or failover.
How well SIP redundancy and / or failover works depends on the interaction between the PBX and the carrier providing the SIP account.
PBX / Gateway
To support various carriers, we bring natively the following features which can be configured:
- Accepting trunk registrations from multiples Sources (GWs)
- Always place the call on a primary trunk and in case of a fault on a secondary trunk or round robin
- Receive calls from multiple trunk registrations
- Route calls between GWs back and forth
- Rerouting of failed calls
Carrier scenarios
Now it depends on the carrier featureset what you can do
Two permanent active SIP Interfaces
- SIP Interfaces on two Gateways with equal configuration
- Both Interfaces register to the Trunk Object in the PBX
- The Carrier must be accept two registration from different souces with the same credentials
- The call distribution is not critical, only needs to be considered in the configuration
- Some carriers put al incoming calls only on the first trunk and expect all outgoing calls over the same first trunk
- Outgoing Calls must first send to the first Interface, then to the second one
- Some carriers use both trunks for incoming and outgoing calls
- Some carriers put al incoming calls only on the first trunk and expect all outgoing calls over the same first trunk
Active SIP Interface, secondary disabled SIP Interface
- SIP Interfaces on two Gateways with equal configuration
- Both Interfaces register to the Trunk Object in the PBX