Digital PBX Adaptor – DPA

by | Mar 7, 2010 | CUC, Uncategorized, Written Theory

The digital PBX Adapter (DPA) voice mail gateways are designed to allow integration of Octel voice mail solutions with Call Manager. DPA uses SCCP to communicate with the Call Manager. It converst DTMF tones to SCCP to enable the communication between the Octel voice mail system and Call Manager.

The DPA will appear on the Call Manager as a collection of  24 IP Phones and the 25th is used to transmit MWI commands. DPA voice mail gateways communicate then with the PBX and Octel voice mail system using the 24 stations lines configured.

Note that there are two other alternative methods of integrating Call Manager with the Octel solutions ( or SMDI solutions):

  • Using a direct SMDI connection between Call Manager (uses of the COM port) and the voice mail system with analog FXS/T1 CAS E&M ports gateway (WS-X6624, VG224). On the Call Manager, the CMI service intercept calls forwarded to voice mail and sends then SMDI messages on the COM port to the voice mail system.
  • Using a VG248, and in that case , the Call Manager connects to the VG248 using SCCP. So the VG248 connects diretly to the voice mail system using an async port for SMDI and analog FXS ports.

G711ulaw / G711alaw Asymetric choice for fax issues on VG224 configurations

by | Jan 29, 2010 | H.323, IOS

On VG224 , you can choose asymetric G711 codec with the voice service voip command for the fax issues.

voice service voip
!
modem passthrough nse codec g711alaw
!

The modem passthrough commands will determine the G711 mode used for outbound calls

But the following part of config will determine the codec use for inbound calls :

!
dial-peer voice 15 voip
description <=== avoid PVID 0 in VG224 ==>
answer-address .
modem passthrough nse codec g711ulaw
session target ipv4:<<loopback_address>>
!

So in our case , the incoming calls will considered in g711ulaw and outgoing calls will be treated as g711ulaw