Troubleshooting; A Simple Example - MikroTik RouterOS v2.9 Reference Manual

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Here we can see how aliases and prefixes are added to numbers table. Entries 0..3 are static. Entries
4 and 5 are added by registering the local endpoint to the local gatekeeper. Entries 6..8 are added by
registering endpoint (with IP address 10.0.0.100) to the local gatekeeper.
For prefixes, '_' is added at the end of dst-pattern to allow any additional digits to be added at the
end.
Local endpoint is registered to the local gatekeeper too. So, local aliases and prefixes are added as
dynamic numbers too. Only, as they are local and corresponding number entries already exist in the
number table, then these dynamically added entries are disabled by default.
If any registered telephone number will conflict with some existing telephone numbers entry, it will
be added as disabled and dynamic.
If in gatekeeper's numbers table there already exists exactly the same dst-pattern as some other
endpoint is trying to register, this gatekeeper registration for that endpoint will fail.

Troubleshooting

Description
• The IP Telephony does not work after upgrading from 2.5.x version - You need to
completely reinstall the router using any installation procedure. You may keep the
configuration using either the installation program option or the backup file.
• The IP Telephony gateway does not detect the drop of the line when connected to some
PBXs - Different regional setting should be used to match the parameters of the PBX. For
example, try using uk for Meridian PBX.
• The IP Telephone does not call the gateway, but gives busy signal - Enable the logging of IP
telephony events under /system logging facility. Use the monitoring function for voice ports to
debug your setup while making calls.
• The IP telephony is working without NAT, but sound goes only in one direction - Disable
H323 service port in firewall: /ip firewall service-port set h323 disabled=yes
• The IP Telephony does not work through NAT - Enable H323 service port in firewall: /ip
firewall service-port set h323 disabled=no

A simple example

Description
The following describes examples of some useful IP telephony applications using MikroTik
RouterOS.
Let us consider the following example of IP telephony gateway, one MikroTik IP telephone, and
one Welltech LAN Phone 101 setup:
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10.0.0.100
10.0.0.100
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