Comrex ACCESS MultiRack, Product Manual

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VIP QC Password - For legacy purposes with the VIP QC app, which has been deprecated.
RTP IP Port - The port used for audio transfer during EBU3326/SIP mode. Since this port info is transferred during
the negotiation process, it can be changed without breaking compatibility. Note: RTSP data is always sent and
received on the port one number higher than this .
Public IP Override - Allows setting of a discrete value of IP address used during negotiation. Used in challenging IT
environments.
Use STUN Server - Determines whether or not to use the STUN derived address in the outgoing fields. MultiRack
has alternate NAT Traversal ability so this is off by default.
SIP Proxy Keepalive - Defines how often the SIP proxy handshake happens when no call is present.
SIP Domain - When registering with some SIP services, a separate domain entry is required. If this is not populated,
the domain of the SIP proxy entry is used.
SIP Auth Username - When registering for some SIP services, a separate Auth Username is required. Do not
populate unless a specific entry is required by the provider.
Send RTP To Source Port - A NAT Traversal function used with smartphone apps. Enabled by default.
SIP Routing - Specifically required by some SIP servers (e.g. OpenSIPS ). Modifies the behavior of the route header.
TCP SETTINGS
MultiRack performs best when using UDP for connections, but there are some rare circumstances when the system
may need to be switched over to TCP operation. This advanced option defines how incoming TCP calls are handled.
Outgoing calls are defined as TCP when their profile is configured. When incoming TCP operation is enabled,
MultiRack normally listens for incoming calls on both TCP and UDP ports, and chooses the first to arrive. If a TCP call
is detected, MultiRack will attempt to use the same TCP link to transmit in the reverse direction.
Accept Incoming Connections - This allows turning TCP Auto Answer on and off. Disabling this function means only
outgoing TCP calls can be established.
IP Port - Users have the option of setting the incoming TCP port number. Default for instance #1 is 9000, and default
for instances 2-5 are 9002-9005 respectively.
Note: Warnings given above about changing port numbers also apply here—calls with mismatched port numbers
will fail.