Think the first is for external access to the admin portion and the second for collaboration. I find this in the Web Proxy course.
AWC: Audio and Web Conferencing (AWC) provides an integrated application to create Audio and Web conferences using corporate directories and personal address books from Microsoft Outlook. AWC is packaged on the Mitel Applications Suite (MAS) server, which is linked by an Ethernet connection to the IP network. The “My Unified Communications portal” on the MAS server allows the administrator to configure AWC, schedule conferences, view conference calls, and administer collaboration controls. Internet Clients wanting to connect with this interface for administration will reference a FQDN on an External DNS that will connect them with the Firewall (HTTPS). The Firewall will forward the traffic to the Web Proxy which in turn will analyze the packets and send the AWC traffic to the correct MAS server, assuming that AWCis enabled in Web Proxy as shown below. Examples are provided later in this module.
The second address is for the listen port.
AWC Listen Port: In addition to the My Unified Communications portal used for AWC administration support, a AWC Listen port is defined to allow AWC Collaboration (i.e. Web conference) traffic to flow from the AWC client to the MAS server via the firewall and Web Proxy. A separate network interface is required at the firewall (you cannot use the same IP Address as the My Unified Communications portal). The firewall takes the Web Conference traffic and converts the port from 443 to a predefined setting. The traffic will be sent to the Web Proxy assuming that the predefined port setting on the Firewall matches the AWC Listen port setting on the Web Proxy (default setting is 4443 to match the AWC defaults). Web Proxy in turn will send it to the MAS server. Examples are provided later in this module
I'd tell you a UDP joke but I'm afraid you won't get it. TCP jokes are the best because you always get them.