Polycom SIP 3.1 manual Automatic Gain Control, IP Type-of-Service, IEEE 802.1p/Q

Administrator’s Guide SoundPoint IP / SoundStation IP

systems. This feature uses noise synthesis techniques to smooth out the noise level in the direction toward the remote user, providing a more natural call experience.

There are no related configuration changes.

Automatic Gain Control

Automatic Gain Control (AGC) is applicable to hands-free operation and is used to boost the transmit gain of the local talker in certain circumstances. This increases the effective user-phone radius and helps with the intelligibility of soft-talkers.

There are no related configuration changes.

IP Type-of-Service

The “type of service” field in an IP packet header consists of four type-of-service (TOS) bits and a 3-bit precedence field. Each TOS bit can be set to either 0 or 1. The precedence field can be set to a value from 0 through 7. The type of service can be configured specifically for RTP packets and call control packets, such as SIP signaling packets.

Configuration changes can performed centrally at the boot server or locally:

Central	Configuration file:	Specify protocol-specific IP TOS settings.
(boot server)	sip.cfg	• For more information, refer to IP TOS <IP/> on page A-56.
Local	Web Server	Specify IP TOS settings.
	(if enabled)	Navigate to: http://<phoneIPAddress>/netConf.htm#qo

IEEE 802.1p/Q

The phone will tag all Ethernet packets it transmits with an 802.1Q VLAN header for one of the following reasons:

•When it has a valid VLAN ID set in its network configuration

•When it is instructed to tag packets through Cisco Discovery Protocol (CDP) running on a connected Ethernet switch

•When a VLAN ID is obtained from DHCP (refer to DHCP Menu on page 3-7)

The 802.1p/Q user_priority field can be set to a value from 0 to 7. The

user_priority can be configured specifically for RTP packets and call control packets, such as SIP signaling packets, with default settings configurable for all other packets.

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