ISDN & PBX

An important point for the integration of ixi-UMS is the connection to the public telephone network. Therefore, an ISDN device or VoIP connection is highly recommended for the use with ixi-UMS Kernel.

The following document will assist you in getting your PBX correctly configured for ixi-UMS: PBX_configuration.pdf

In order to find out how many B-channels you need, you must take into account the number of incoming and outgoing messages per day. You can use the following figures:

- A fax page takes 1 minute to be transmitted. Failures and retries included.

- One SMS takes only a few seconds to be transmitted and can be neglected in this calculation.

- Voice mails should be treated like fax messages in this computation.

Another important point to consider is the time of the day when you are under the most stress (peak hours, rush hour). For example, the time in the morning when users listen to their new voice messages that have accumulated overnight, or when marketing starts with a fax campaign (serial fax) in the evening must be taken into account.

Examples:

Example a)

·A company has only two employees,

·the task of these employees is to send a large amount of mail merge faxes every day  (e.g. mailings).

·A mailing consists of 500 fax messages à 2 pages (=1.000 pages)  

·ixi-UMS Kernel configured with 4 B-channels.

Calculation:

As mentioned above, one fax page takes 1 minute to transmit. In the case of mailing, the transmission time is 250 minutes when using 4 B channels.

Example b)

·Company with 100 employees

·The services Fax and Voice are used

·About 1000 fax pages are send and received per day

·The faxes are sent and received mainly between 8 a.m. and 6 p.m.

·Every telephone shall get a call forwarding (when busy) to the ixi-UMS Server

Calculation Fax:

1.000 pages x 1 minute / page = 1.000 minutes = 16.6 hours

The delivery time for 1.000 fax pages with 1 B-channel would be about 16.6 hours. In order to be able to receive the faxes in the period between 8 a.m. and 6 p.m., at least 2 channels would be required.

During this period, no channel would be available for the feature Voice (ixi-UMS Voice-Mailbox). Moreover, you have to take into account that the distribution of the send and received fax messages is not consistent.

Calculation Voice:

At the company, roughly every 15 minutes, a call is forwarded to the ixi-UMS Enterprise Server. They want to make sure that there is always a free line available for the voice box.  

In order to guarantee the availability of the voice box and the sending and reception of faxes for every user, at least 8 channels should be deployed.

For further information and calculation examples, please contact: sales@estos.de.