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Voice Feature Guide 01

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H.248/SIP over SCTP

H.248/SIP over SCTP

Currently, most devices adopt H.248/SIP over UDP. H.248.4 recommends H.248/SIP over SCTP, which implements the message retransmission at the application layer through SCTP.

Compared with the UDP protocol, the SCTP protocol has the following advantages:

  1. Reliability: Messages can be transmitted fast and reliably through SCTP.
  2. Multi-homing: With the multi-homing feature, multiple IP addresses are supported on an SCTP endpoint. That is, an SCTP endpoint can use multiple physical network ports to enhance the endpoint reliability.
  3. Congestion control: The congestion control through SCTP is similar to the congestion control through TCP.
  4. Heartbeat mechanism: SCTP provides the heartbeat mechanism at the network layer.
  5. Security: Four-way handshake and cookie mechanisms effectively prevent the DoS attack.

As shown in Figure 1-164, the IP protocol is used at the network layer, SCTP the transport layer, and H.248/SIP the application layer.

Figure 1-164 Protocol architecture of H.248/SIP over STCP

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Updated: 2019-02-22

Document ID: EDOC1100067358

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