Technical data

96 Chapter 4. Configuring Special Features
Configuring Voice
The ATM voice router supports 4 voice channels and multiplexes them over a single ATM stream which is
configured as a PVC. Each voice channel takes about 80kb of bandwidth (64kb PCM plus cell overhead). This
bandwidth is used as soon as the phone goes off hook. Voice has priority over data. The data path goes over a
second PVC.
This version of software does not support ADPCM, so be sure the voice gateway is set to PCM.
The voice PCV is automatically set, but can be changed with the following:
• atom voicePVC <vpi number>*<vci number>
or if frame relay:
• frame dlci <dlci number>
The defaults are:
• atm - pvc = 0,39
•fr - dlci = 22
The voice pvc goes through the ATM network to a voice gateway. There are two gateways currently supported.
Separate kernels are required for each gateway type. The version command tells you which gateway the kernel is
complied for, e.g.
•# ver
• FlowPoint/2200 SDSL [ATM] Router
• FlowPoint-2000 BOOT/POST V5.5.0 (13-Oct-99 13:26)
• Software version fp2200-1201 (BETA 3) v3.5.0 built Fri Oct 15 08:48:31 PDT 1999
• Maximum users: unlimited
• Options: SDSL, VOICE-JETSTREAM, RFC1483, IP, IP FILTERING, WEB, L2TP, ENCRYPT,
BRIDGE, IPX
The software version string displays the model number and goes as follows for SDSL:
2200V-xxyy - where xx is the DSLAM and yy is the voice gateway.
This release supports builds for:
• 2200V-1201 - Nokia and Jetstream
• 2200V-1202 - Nokia and Coppercom
• 2200V-1601 - Copper Mnt and Jetstream
• 2200V-1602 - Copper Mnt and Coppercom
If you use the default pvc, no configuration is required for voice. After the router WAN link activates (LINK LED
is green) you should get dial tone, even if the IP and bridge network settings are not configured. If this fails, the
DSLAM may not be configured for your voice PVC to the voice gateway. When you go off hook you should see
the WAN LED flash rapidly indicating voice cells are being sent.
The actual dial tone is provided by the a DMS500 switch via the voice gateway. All voice features of the switch
are passed through to the phone set. So features like call forwarding, caller id, transfer etc are all supported if they
are subscribed to. The actual phone numbers for each port are also set by the Voice Network Provider.