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Configure how to respond to ENQ

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The enquiry (ENQ) byte, hex value 0x05, can be used by a PMS protocol in one of two ways:

1. As a handshake protocol, where the server wishing to send a message packet first sends an ENQ and waits for an ACK before it sends the message.
2. As a recovery protocol, where the server sends a message packet and if it does not receive an ACK or NAK response within a specified time, it will send an ENQ to request that the receiver resend its last response.

 

In the second case, the receiver would either resend the ACK (or NAK) it responded with to the last message packet it received or, if it has been a specified length of time since it last received a packet, then it would always respond with a NAK.  The assumption, then, is that the receiver never actually received the packet sent by the sender, so the sender would resend it.

 

By default, the DV2000/DV4 responds to ENQ bytes according to the second scenario.  If your PMS uses the first scenario, where it always expects the receiver to respond with ACK to an ENQ, then you will need to enable this setting.

 

To configure how the VMS responds to ENQ bytes, follow these steps:

 

1.  Using Activity Monitor, stop the voice mail service.

 

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2.  Run the System Configuration application and select Features | Hospitality.

 

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3.  If prompted, select the PMS instance (as shown below).  This dialog is only displayed if you are licensed for more than one PMS instance.  Otherwise, skip to step 4.

 

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4.  Select the PMS property page (in the tree view on the left).

 

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5. In the section Other, check the Always respond to an ENQ with ACK box if you want the VMS to always respond with ACK, or uncheck the box if you want the VMS to respond by resending the ACK or NAK it responded with to the last message packet it received.
6. Click Apply to save the setting without closing the dialog.
7. If you are finished configuring hospitality settings, click OK to save and close the dialog.
8. Once you are finished with all configuration changes, close System Configuration.
9. Using Activity Monitor, restart the voice mail service.

 

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