Survivability Mode Display On Aastra Ip Phones; Alternative Routing On Detection Of Failed Sip Response - AudioCodes Mediant 800B User Manual

Media gateway & enterprise session border controller (e-sbc)

Hide thumbs Also See for Mediant 800B:

Table of Contents

User's Manual

35.5.4 Survivability Mode Display on Aastra IP Phones

If the SBC device is deployed in an Enterprise network with Aastra IP phones and

connectivity with the WAN fails, the device provides call survivability by enabling

communication between IP phone users within the LAN enterprise. In such a scenario, the

device can be configured to notify the IP phones that it is currently operating in Survivability

mode. When this occurs, the Aastra IP phones display the message, "StandAlone Mode"

on their LCD screens. This feature is enabled by setting the SBCEnableSurvivabilityNotice

parameter to 1.

When this feature is enabled and the SBC device is in Survivability mode, it responds to

SIP REGISTER messages from the IP phones with a SIP 200 OK containing the following

Content-Type: application/xml

<?xml version="1.0" encoding="utf-8"?>

<LocalModeDisplay>StandAlone Mode</LocalModeDisplay>

</LocalModeStatus>

</LMIDocument>

Alternative Routing on Detection of Failed SIP

The device can detect failure of a sent SIP response (e.g., TCP timeout, and UDP ICMP).

In such a scenario, the device re-sends the response to an alternative destination. This

support is in addition to alternative routing if the device detects failed SIP requests.

For example, assume the device sends a SIP 200 OK in response to a received INVITE

request. If the device does not receive a SIP ACK in response to this, it sends a new 200

OK to the next alternative destination. This new destination can be the next given IP

address resolved from a DNS from the Contact or Record-Route header in the request

related to the response.

Mediant 800B Gateway and E- SBC

35. Advanced SBC Features