What points should I check if a SIP connection is not working?
If the SIP Server Authentication / Registration is not succeeding? Check the formatting of the User Names, Passwords, Number and Codec type. Any errors or typos will cause authentication and registration to fail.
Is the codec type chosen supported by the SIP server? If the call that is failing this could be a codec negotiation failure.
Check the Registrar expiration time in the Gateway Editor? Go to > Host Advanced Editor > Aliases page. The default expire is 3600 seconds; depending on the SIP server this may need to be reduced to 120 seconds.
Does the same SIP number fail each time? This could be due to the SIP alias in question not registering with the SIP server and would suggest an incorrect setting, may be a typo in the number, password etc.
If you are making multiple SIP calls and it is the last call, regardless of the number dialled that does not connect then check the number of DSP that have been allocated for IP phone connections on the Host Advanced Editor > Audio page.
Each active (dialled) SIP aliases will use an IP phone connection audio DSP channel; the Gemini has a total of 32 or 64 DSP channels, depending in the module installed. A number of DSP must be allocated for the SIP ‘IP Phone’ connections, depending on the number of concurrent calls expected to occur in the system. If for example you allocate 18 DSP channels for the IP phone connections, this will allow a maximum total of 18 simultaneously active SIP calls to be made on this Gemini host.
Can the Gemini ping the SIP server? If the Trilogy SPY debug log indicates the Gemini is not able to register to the SIP server. The next logical step is to see if the Gemini can ping the IP address of the SIP server.
Using the SPY log application type the following to see if the Gemini can ping the SIP server.
In the SPY log window type >
cmd [return]
ping “IP address of the SIP server”
Below is a typical capture of a successful ping test:
Using DNS for the SIP server connection? To connect a Gemini system with a DNS address to the SIP Server please ensure the DNS address is entered in the Domain advanced editor > General page.
On the Domain page you will need to declare the IP address of the DNS server so the Gemini hosts know where to look to resolve the DNS name for the SIP server.
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