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Support Center » Knowledgebase » 3CX Windows IP PBX » Media Server reports Binding Failed
 Media Server reports Binding Failed
Solution If the Media Server needs to allocate a port for media transmission, and cannot bind, it will generate a log message such as:

MediaServerReporting::InitEndPoint [MS003003] C:179.1: RTCP socket 10.0.0.173:7023 binding failed with error code 10048

This is due to some other application already binding to some ports in the 7000-7499 range. Typically it is the Microsoft DNS server doing this. To check which ports are bound at any point in time, you can run the following command from the DOS prompt:

netstat -ano -p UDP

Microsoft Windows allows you to define which port ranges will NOT be returned to any application/service that requests a random port number, via the following registry entry:

Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:

How to back up and restore the registry in Windows: Article # 322756

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\ReservedPorts

To ensure correct functionality, you should add the following ranges, without removing whatever the value already contains:

3478-3478STUN / Firewall Checker
5000-5000MyPhone Interface
5060-5090SIP Port for 3CX PhoneSystem and Tunnel Ports
5480-5490Management Console, FAX Server, Other 3CX Components
7000-7499range of RTP ports for Local Connections
9000-9049range of RTP ports fo External Connections
40000-41000Conference, IVR, Parking Orbits


If the value already contained "1433-1434", the end result would look something like this:

Port Ranges

For more specific instructions regarding this registry entry, refer to: http://support.microsoft.com/kb/812873/


Article Details
Article ID: 697
Created On: Dec 18, 2009 01:42 PM

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