Ivanti recommends setting this value to 1800 seconds. To Specify the Interval at which the Voice Server Checks for an Offline SIP Phone:ģ.In the SIP Session Timer field, specify the number of seconds you want Ivanti Voice to wait between sending refresh requests. This can inadvertently cause the remote end to terminate the SIP session.

Waiting for the full interval to expire is risky, as the remote endpoint may also keep track of that session and delay the refresh request if network problems occur. Ivanti Voice sends refresh requests when half the session interval expires, as recommended by the SIP standard. Ivanti Voice also notifies the voice application about the disconnected call. If there is no response from the remote side, Ivanti Voice considers the connection lost and releases all resources connected to the call. Ivanti Voice achieves this detection by sending a refresh request for every call on every half interval you specify.

For example, if a caller unplugs the network cable from a SIP-enabled phone while on a call with the voice application, Ivanti Voice detects the session is over, even though Ivanti Voice does not receive the message indicating the caller hung-up the handset, which typically closes the SIP session. Ivanti Voice detects SIP sessions that have lost connection instead of properly closing the connection. Change this value only if Ivanti Voice might interface with a gateway that requires the payload to be different.Ĥ.Click the Update and Commit Changes buttons to enact your changes. Most deployments can use the default payload type, which is 101. The Voice Server Advanced Configuration page opens.ģ.Complete the RFC2833 DTMF Payload field, which configures the payload type to use for out-of-band DTMF detection and generation. To Configure the DTMF Settings for the Voice Server:ġ.On the Management Portal menu window, click System Configuration > Voice Server > Advanced Configuration. Dual Tone Multi-Frequency (DTMF) Settingsĭual Tone Multi-Frequency (DTMF) is a system used by touch-tone telephones in which a specific frequency consisting of two separate tones is assigned to each key so that it can easily be identified by a microprocessor. You can configure the following settings on the Advanced Configuration VoIP tab for the voice server.

Dtmf voip