Question

How can the channel capacity for a T1 VoIP system be increased from the default of 384 channels to 480 channels?


Answer

The default maximum channel capacity for a T1 VoIP system is 384 (24 channels per trunk, with a maximum of 16 trunks).


The limit only applies when connecting Blueworx Voice Response to a traditional telephone network. When configured to use a VoIP connection with DTNAs, there is no physical reason for this limit. It is, therefore, possible to configure Blueworx Voice Response as an E1 system when in a traditional T1 environment to enable an increase in capacity to 480 channels (30 channels per trunk, with a maximum of 16 trunks).


Notes:

  1. This change will only work if the Blueworx Voice Response system is a VoIP only configuration. If there are any physical adapters, DTXA or DTTA, the change cannot be made.
  2. If any state table applications use uncompressed voice segments, this change will not work as the audio is stored in mu-law for T1, and so will play in the wrong format for an E1 system.


To configure Blueworx Voice Response in this way, the Country / Region section of Pack Configuration needs to be set to Other E1. To do this, perform the following steps:

  1. Start Blueworx Voice Response.
  2. In the Blueworx Voice Response Welcome window, select Configuration -> Pack Configuration -> Change.
  3. Select the Country / Region button and choose Other E1 as the country, press OK and then OK again to confirm the choice.
  4. Configure the packs and channels, as usual, save the changes and restart Blueworx Voice Response.


If the Blueworx Voice Response system has been used as a T1 system previously and is running VoiceXML applications, it will also be necessary to delete the VXML2 audio cache before taking new calls. To do this, perform the following steps:

  1. Stop VRBE if it is running (dtjstop followed by dtjshost -exit).
  2. As dtuser, cd into $CUR_DIR/voice/ext/v2c and delete all directories and files within that directory.
  3. Restart VRBE (dtjshost followed by dtjstart).