Knowledgebase: IPPBX
How to configure and use the MWI on VigorIPPBX 2820
Posted by on 13 February 2012 04:52 PM

What is MWI?

MWI is namely Message Waiting Indication. Messaging Waiting Indication is a common feature oftelephone networks. It typically involves an audible or visible indication that messages are waiting,such as playing a special dial tone (which in telephone network is called message-waiting dial tone),lighting a light or indicator on the phone, displaying icons or text, or some combination(draft-ietf-sipping-mwi-04.txt).

VigorIPPBX 2820 supports MWI feature. With this feature, when someone leaves you a voicemessage, a special tone (MWI tone) will be played while you pick the phone up. This implies thatyou have a voice message. After listening such special tone, you will hear the normal dial tone. Thenyou can choose to listen to the voice message or call someone back.


Example for using MWI

Here, we use the following illustration to make an example for using MWI.Generally, Jacky uses mail client to receive voice mails. But it’s not convenient to check voice mailvia mail client at all times. Especially there is a possibility that voice mails may be dropped ordeleted by an accident due to Antivirus scan. To avoid it, Jacky also uses MWI feature ofVigorIPPBX 2820 to inform himself of missed phone calls.

Configure MWI for Jacky’s Extension

1. Open the extension profile for Jacky. Below shows the explanation of basic configuration.Jacky’s Extension Number is 211. Display Name is locally significant for identification. Makesure the Type is SIP. Enable Authentication and type a Password for this extension. Input anE-mail address for Jacky to receive voice mails.

2. Select either Notify User who Subscribed or Force Notify User for MWI.
Voice mail Password:

If you want to listen to the voice mail by phone via VigorIPPBX 2820, you must configure thevoice mail password. It can prevent someone else listening to your voice mail. Namely, usersneed to input the voice mail password before they listen to the voice mail.

Notify User who Subscribed:

Most IP Phones support MWI feature. You can enable or disable it for your requirement. When Notify User who Subscribed is selected, VigorIPPBX 2820 will send MWI to the IP phonewith MWI enabled. However, if the IP phone does not enable MWI function, VigorIPPBX 2820will not send MWI to that IP phone.

ForceNotify User:

When Force Notify User is selected, VigorIPPBX 2820 automatically sends MWI to the clientswhen there is voice message no matter the IP phone enables MWI function or not.



Additional Configuration for Voice Mail

Go to the IP PBX >> PBX System >> Voice Mail Configuration page and configure the followingitems

Extension for checking messages:If you want to listen to a voice mail, you need to dial the number which is set in the field ofExtension for checking messages. The default value is 888. You can change it manually.

Day for keeping voice mail:It means the time for keeping a voice mail in VigorIPPBX 2820. The default value is 3 (days). Afterthe time, this message will be deleted automatically.

Send Voice Message by Email:Tick it to enable the voice mail function.

Delete Voice Message after Sending Mail:If you are using MWI, do not enable such option. No MWI notification will be sent after a voicemessage is deleted.



1. Mike calls and dials extension number 211.

2. Jacky is not available at that time

3. Mike leaves a message to Jacky, then hands up the phone.

4. Jacky is free and picks up his phone.

5. Instead of the normal dial tone, Jacky hears a special tone (MWI tone) which implies that he hasa voice message. After listening the special tone, Jacky will hear the normal dial tone.

6. Jacky dials 888 and input the voice mail password to hear his voice message.

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