Advanced Voice Options

Use the Advanced Voice Options dialog box to set quality of service (QoS) and security for Enterprise Voice.

Quality of service

To configure quality of service for this pool, you can change the settings used for Voice QoS and 802.1p Voice.

Voice QoS value

To assign higher priority to audio packets at routers performing Network Layer IP-based packet routing, type the value to be used. The default is 40. For optimum quality of service, it is recommended that you do not change the default value.

802.1p Voice

To assign higher priority to audio packets at the nodes performing Data Link Layer switching within a local area network (LAN) segment, type the value. The default is 0. For optimum quality of service, it is recommended that you do not change the default value.

SIP security

Use this setting to implement the appropriate transport and authentication requirements for Office Communicator Phone Edition devices connecting to Office Communications Server 2007 R2.

SIP security mode

Specify the security mode used by Office Communicator Phone Edition devices in this pool. For security reasons, the default is High.

• To enable Office Communicator Phone Edition devices to use any transport and any authentication method, including Basic or Digest, to connect, in the drop-down list box, click Low as the security mode.

• To enable any transport but require either NTLM or Kerberos authentication, in the drop-down list box, click Medium as the security mode.

• To require a Transport Layer Security (TLS) connection and either NTLM or Kerberos authentication, in the drop-down list box, click High as the security mode.

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For an acceptable quality of service for Enterprise Voice, the IP network must assure that packet loss, delay, jitter, and bandwidth fall within acceptable ranges. Voice communication in particular is intolerant of packet loss and delay and requires greater bandwidth than data transmissions. The Voice QoS value setting and 802.1p Voice setting work together to assure that your IP network assigns top priority to audio packets, based on the settings you specify as follows:

• The QoS value allows you to assign higher priority to audio packets at routers performing Network Layer IP-based packet routing. The default value of 40 represents an IETF Differential Service Code Point, which is used to mark packets so that routers can provide appropriate per-hop behavior based on the class of traffic. For optimum quality of service, you should use the default value.

• The 802.1p standard allows you to assign higher priority to audio packets at the nodes performing Data Link Layer switching within a LAN segment. The default value of 5 assigns high priority to audio packets. For optimum quality of service, you should use the default value.

The Session Initiation Protocol (SIP) security settings are used to specify transport and authentication requirements for Office Communicator Phone Edition devices connecting to Office Communications Server 2007 R2. If you do not configure a policy setting, an IP phone can use any transport, but if it does not use TLS and the server authenticates users, then the phone must use either NTLM or Kerberos authentication.

For details, see the Operations section of the Office Communications Server Technical Library.