HELLO & WELCOME

[spare]

Hi

If I have someone's SIP address, is there any way to work out the IP address of his server? And will the extension to connect to always be the number at the beginning of the SIP? (Hope I'm making sense, I'm not very good with this technical stuff...)

[WelshPaul]

Yes and yes (unless they change it).

Try pinging the SIP address or run a traceroute, should return the IP address.

[spare]

Any way to do it without contacting him, just from the SIP address itself?

Thanks!

[WelshPaul]

You don't need to contact him, ping the SIP address or run a traceroute and the IP address should be shown in the results.

[spare]

Thanks very much. Really appreciate it!

[spare]

Is there a problem with using an IP address of a SIP address that the IP address can change often?

[VoipIT]

Is there a problem with using an IP address of a SIP address that the IP address can change often?

The local IP address of a device or the SIP server IP? Device, no. SIP server, yes.

[spare]

I assume when you say yes to the SIP server you mean yes its NOT a problem? (Or did you mean yes it is a problem?)

[VoipIT]

I assume when you say yes to the SIP server you mean yes its NOT a problem? (Or did you mean yes it is a problem?)

I mean yes it is a problem. Think about it, if the SIP servers IP address changes but you're still using the old IP address to connect then your going to lose registration.

An example:
My phone number is 1234, you have 1234 programmed in speed dial, I change my phone number to 4321 but you still have 1234 programmed in speed dial. What do you think is going to happen if you dial 1234 or press the speed dial button? You're going to either get an error, or get connected to the new owner of that phone number.

Instead of a phone number to reach a destination, you're using an IP address but the result is the same.

[spare]

Well then I suppose the question is then how likely is it that the IP address will change? How often do companies change their servers? Is there any way of knowing?

[VoipIT]

They should be using a static IP address because static IP addresses never change!

[spare]

?????

[WelshPaul]

If you're running any kind of server then you should be using a static IP because a static IP doesn't change, even if you change servers or hardware configurations.

https://support.google.com/fiber/answer/3547208?hl=en

[spare]

What I wanted to know is what is the chance of a SIP address from a regular VoIP company changing its IP address. I thought its unlikely that a proper established company would be changing their IP address too often. Is that correct?

Thanks for the answers

[WelshPaul]

What I wanted to know is what is the chance of a SIP address from a regular VoIP company changing its IP address.

The IP address will never change unless they choose to change it.