Carrier Access CMG Router user manual Signaling Type

Profile Directory:Router Card Profile

Voice Channels

<T38reserved> - Fax calls to/from the voice channel are handled using T.38 method (Gateway- controlled T.38 fax relay using NSEs). Since this method pre-allocates DSP resources, the user can only configure up to 6 T.38 connections per card.

Modem - Sets the modem handling for this endpoint.

<none> - Modem 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> - Modem calls to/from the voice channel are handled using the modem bypass procedure (Gateway-controlled modem bypass using NSEs). After a call is connected to the channel in voice mode, if a modem 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, or the one offered by the far end gateway. Note: for modem calls (not fax calls), the gateway that initiated the bypass (terminating gateway) then sends a "Disable echo cancellation" NSEs (193). After this both gateways should turn off echo cancellation.

Signaling Type

<FXS LS> - FXS Loop Start. Default.

<FXS GS> - FXS Ground Start.

Short Inter Digit - Configures the short interdigit user dialing timeout on a voice channel. This is the time allowed between dialed digits when the T or I address template specification is in effect. For example, if the address specification is "xxxxT", and 4 digits have been dialed, this short timeout is in effect. If the timer expires, the call will be routed to the destination. If another digit is dialed before the timer expires, address processing will continue, using the long interdigit timeout. The range is 1-10 seconds, with a default of 4.

Long Inter Digit - Configures the short interdigit user dialing timeout on a voice channel. This is the total time allowed between dialed digits after the first, unless short timing is in effect. If the originator does not dial the next digit in this time period, the call is torn down. The range is 1-60 seconds, with a default of 16.

Echo Cancellation - Enables/disables echo cancellation as the default for voice calls for a voice channel.

<Disabled> - Disable echo cancellation as the default for voice calls. <Enabled> - Enables echo cancellation as the default for voice calls. Default.

Echo Tail (ms) - Defines the maximum round-trip delay expected in the voice path between the CMG and the phone, including acoustical delay at the phone. Options are: <8>, <16>, <24>, <32> and <64>. Default is <16> milliseconds.

CMG Router - Release 2.7 3-45