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Voice Channels

Type of Service - Defines the default value for the Type of Service (TOS) in the IP header of outgoing VoIP packets for the specified channel. The initial default is zero. The definition of the TOS byte is provided in IETF RFC 791 for the original method of packet classification, and in RFC 2474 for the differentiated service method of classification. In the original classification scheme, the first (leftmost) 3 bits of the TOS byte represents the "precedence" or priority. Bit 4 (from the left) indicates optimize for delay. Bit 5 indicates optimize for throughput. Bit 6 indicated optimize for reliability.

DTMF Relay - Enables or disables the relay of DTMF packets as per RFC 2833.

<Disabled> - Disables DTMF Relay as the default for voice calls. <Enabled> - Enables DTMF Relay as the default for voice calls. Default.

Slash - Removes implied slash between endpoint and suffix and prefix.

<Disabled> - Suppress the use of a slash between the endpoint prefix and suffix. <Enabled> - Insert a slash between the endpoint prefix and suffix.

Calling Party Disc - Requests that calling party disconnect be played automatically to an endpoint after the last connection on that endpoint is deleted.

<Disabled> - Do not play CPD on the endpoint. Disabled is the default.

<Enabled> - Play CPD on the OSI signal or after the last connection is deleted on endpoint. <Osi> - Play CPD on the OSI signal only

Fax - Sets the fax handling for this endpoint.

Note: For the Fax to operate the following must be set:

CMG G.729A feature must be enabled, with a software key

Specified voice channel has Fax configured as T38reserved or T38

G.729A codec is enabled

<none> - Fax calls to/from the voice channel are handled as normal voice calls. Note: G711mu is the only codec that will result in good fax and modem calls. In this mode echo cancellation must be OFF for modem calls, and ON for fax calls.

<bypass> - Fax calls to/from the voice channel are handled using the fax bypass procedure (Gateway- controlled fax bypass using NSEs). After a call is connected to the channel in voice mode, if a fax tone is detected on the channel, the CMG will transmit NSEs to the remote gateway to tell it to switch to a G.711 codec and then it will switch to a G.711 codec itself for that channel and disable silence suppression. For the switchover to be successful, the remote gateway must also switchover to G.711. The form of G.711 (mu-law or A-law) to which the codec is switched will be the form which has the highest priority in the negotiated codec list. Note: Either G711mu or G711a must be on the algorithm preference list for Fax Bypass to work.

<T38> - Fax calls to/from the voice channel are handled using T.38 method (Gateway-controlled T.38 fax relay using NSEs) if DSP resources are available. When no DSP resources are available (6 active T.38 fax calls) the card will reject the T.38 connect request and revert the channel to fax bypass mode using the G.711 codec.

3-44 CMG Router - Release 2.7