The User Datagram Protocol is the IP protocol that delivers data in the same manner in which it was sent. For example if the sender transmits 20 bytes in a packet, they are delivered to the receiver as 20 bytes.
UDP is an alternative communications protocol to TCP used primarily for establishing low-latency and loss-tolerating connections between applications on the internet. Where UDP enables process-to-process communication, TCP supports host-to-host communication. TCP sends individual packets and is considered a reliable transport medium; UDP sends messages, called datagrams, and is considered a best-effort mode of communications.
UDP is an ideal protocol for network applications in which perceived latency is critical. In order to increase the connection timeout you can modify it from the firewall access rules. Blueface recommends the UDP has a Keep Alive timeout set to “200 seconds”. Should the network go down, this window allows the phones to be pinged a few times to attempt a reconnection automatically. Some routers or firewalls may have this predefined at a lower value.