SIP phone on OXO R1

[FabulousGee]

Hey guys,

we have an old OXO R1 (we got that in 2009 I think - it's relabeled as T-Systems Octopus Open) and ran into a problem lately. We are preparing to get a new upgraded telephone system but it might need another year to accomplish that due to several (internal) restraints...
Unluckily we need another phone right now and therefore have been looking into SIP phone creation in our OXO. We got all phones analog until now so never have bothered about SIP stuff. Now, all analog ports are blocked so we need the SIP phone to go beyond that point.

I hope you are able to understand the description since it's not in English on our side so I have to try to translate it.
We created a new user as "IP participant" and then changed the type to "Basic SIP phone" afterwards. We set the number to 37, activated "SIP authentication" and copied the given password.
Then we tried to connect our SIP client with the IP address, port 5059 and the given number "37" with the password given.
But it doesn't seem to connect? I can't even give a trace since there is no real output.

To me it looks like that whole port 5059 isn't even opened. I tried 5059, 5060 and even tried to port scan any other open ports - I found TCP 80, TCP 443 and IIRC UDP 1722(?) and UDP 2555 - but no other open ports up to 5060.
I read we would need licenses to activate elevated features like redirecting and stuff but if I understood correctly, Basic SIP phone would work without special license, right?

Is this expected behaviour or is there any fault in our configuration?
Does this port/SIP stuff need any other configuration first?
Is it maybe not even supported or some hardware/license missing?

Thanks for any heads up.

[alex]

ARe you sure its OXO R1? Seems to me that OXO R1 didnt support SIP at that time.
You can check licenses/SW version in PM5/OMC or whatever you have to programm PABX.

[FabulousGee]

In the left lower corner it said "Telekom Octopus Open R1.x //..// R32.x" so I thought it might be the R1.

We have the OMC, as for the SIP licenses we got none. I can get a screenshot later if you would need one.
What software version do you need to know exactly?

Edit: here is the licenses being available

Lizenzen.png