# Call handling and delivery

These pages explain how inbound SIP calls can continue to another eligible
destination after a failed delivery attempt, how DIDWW delivers fax calls
using T.38, and how a receiving SIP platform can redirect or transfer calls
through a DIDWW outbound SIP trunk.

## Explore call handling features

**Service failover and load balancing**

Understand DIDWW network redundancy and DNS SRV and Trunk Group
failover and load balancing.

[Service failover and load balancing](service-failover-and-load-balancing.html)

**Fax support**

Understand T.38 fax delivery, availability, and troubleshooting.

[Fax support](fax-support.html)

**Inbound call redirection**

Compare SIP 30x Redirect and SIP REFER transfers.

[Inbound call redirection](inbound-call-redirection.html)

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