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Quality of service.

Quality of service

The quality of the Voice over IP (VoIP) system is reliant on a good network infrastructure that can transport the voice data and signalling packets reliably and in good time.

Quality of service (QOS) will help to maintain the delivery of voice data over a given network and we recommend that wherever possible in your network appropriate QOS settings are used to alleviate potential bottlenecks.

  1. VoIP signalling (SIP) traffic is transferred to and from port 5060 on all end-points and servers, these packets should be highest priority and dropped only as a last resort.
    VoIP
    signalling (SIP) packets should be marked with either a diffserv setting of EF,
    ‘type of service’ (TOS) tag of 184, or an IP priority of 5 to ensure they
    are classified and prioritised correctly.
  2. VoIP voice data (RTP) traffic
    should
    be marked with either a diffserv setting of EF, ‘type of service’
    (TOS) tag of 184, or an IP priority of 5 to ensure they are classified and
    prioritised correctly
    is tagged with a ‘type of service’ (TOS)  tag of 184 (priority of 5), these packets should be prioritised over other traffic but may be dropped to allow signalling traffic to be transmitted.
  3. All network equipment must also be set to full-duplex if possible.

Note that Pulsant’s core network is configured to provide QOS for traffic
marked
with either a diffserv setting of EF, ‘type of service’ (TOS) tag of 184, or an
IP priority of 5 to ensure they are classified and prioritised correctly.