Cisco 28xx integration with OCS

[LEFT][CODE]http://unplugthepbx.spaces.live.com/blog/cns!4D26B6FE389A40B6!735.entry[/CODE]

OCS 2007 R2 utilizes 183 SDP instead of 180 Ringing and therefore causes certain gateways including the Cisco 2800 (2811, 2821, 2851) ISRs to fail if running 12.4(22T) or before. I have not seen an update to OCS or the Cisco code to fix this yet so I am posting this again for reference on this site.

The following file should be saved as RespondWithRinging.am and placed in a location on your FE server. Replace the lcappUri with a more appropriate domain name. This then can be added to the Front End Scripts on each front end server as shown in the image below.

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[CODE]<?xml version="1.0"?>
<lc:applicationManifest
lc:appUri="[URL]http://www.contoso.com/RespondWithRinging[/URL]"
xmlns:lc="[URL]http://schemas.microsoft.com/lcs/2006/05[/URL]">
<lc:requestFilter methodNames="INVITE"
strictRoute="false"
registrarGenerated="true"
domainSupported="true" />
<lc:responseFilter reasonCodes="NONE" />
<lc:proxyByDefault action="true" />
<lc:scriptOnly />
<lc:splScript><![CDATA[
// This script will respond to incoming INVITEs from
// the mediation server.
// Build the [EMAIL="user@host"]user@host[/EMAIL] from the To: header.
toUri = GetUri( sipRequest.To );
toUserAtHost = Concatenate( GetUserName( toUri ), "@", GetHostName( toUri ) );
Log( "Debug", false, "RespondWithRinging: we have a request: ", sipRequest.Method, " ", toUserAtHost );
// Check if this is a re-INVITE and exit if so
foreach ( sessionExpires in GetHeaderValues( "Session-Expires" ) ) {
if ( ContainsString( sessionExpires, "refresher", true ) ) {
Log( "Debug", false, "RespondWithRinging: * skipped; This looks like a session refreshing re-invite" );
return;
}
}

// Check to make sure that the INVITE is from a mediation server
foreach ( userAgent in GetHeaderValues( "USER-AGENT" ) ) {
if ( ! ContainsString( userAgent, "mediation", true ) ) {
Log( "Debug", false, "RespondWithRinging: * skipped; not a mediation server request" );
return;
}
}
// If we're here, send a 180 response
// Headers are being added in case it's important to detect this generated 180 response in a log
Log( "Debug", 1, "RespondWithRinging: * Ringing response being submitted" );
AddHeader( "FAKED-180", "true" );
Respond( 180, "Ringing", "FAKED-180=true" );
return;

]]></lc:splScript>
</lc:applicationManifest>
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