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If you look at the certificate you will see either that it has no issuer (self signed) or if it has one (usually something like ipoffice-root…). In the second case it is generated by the internal CA. No need to upgrade, even if it is suggested though because the underlying OS (CentOS) of the...

I guess the NSi is missing though. Nevertheless the carrier should replace an wrong or missing caller ID with a valid one that belongs to that trunk.

If NSi is not set, maybe some information from Trunk Call Details or user‘s SIP entry is inserted.

You can for sure even all you carrier to go to SIP as replacement for E1. If you really have no TDM phones you would then be able to drop the IP500.

You can do it without update. You should check if the certificate is generated by the IPO device itself (self signed) or by the CA that is inbuilt in the Server.

8xxxxxxxxx/Dial/18N ?

But this would mean that you not only have to get telephony licenses (or E5) for teams but also a dial plan.

Correct. Makes only sense if you have a reason to keep the control unit I.e. for analog or digital extensions or trunks.

That’s a new topic

You can get two SE licenses and add the existing chassis to the new SE solution. This will give you two more VM Channels and you can connect any analog extensions or trunks to the IP500 if needed

That sound like a bad configured dial short code.

Please be more specific about the mentioned expiring certificate. Probably the message is about a certificate in trusted store that is expired. You will probably see more alerts in SSA.

Check SysMon. You did see SNMP requests. You can’t test UDP connectivity and SNMP is UDP. IPO for sure is lending in far more ports than only port 80 as it is essential for Voice connectivity and other services.

Check the „Mobile Answer Guard“ settings in the twinned user settings. This is meant to avoid that a twinned call goes to an external mailbox. If a call is answered at the twinning destination within the configured time, IP Office interprets it as answered by a voicemail system and stops the...

Maybe the computer time is wrong

For me it sounds as if the push message is received but the app is not able to start and/or register on the background. Sounds like an app issue in my mind. Did you check if there are SIP REGISTER message are received at the SBC in this case? If not the issue is located at the client. If they...

Create them manually together with the users. Basic calling usually works with all SIP endpoints. But you will need 3rd party IP endpoint licenses

Did you check this? I would not recommend to convert the phone to H323. This will not bring you a step further to the solution. Especially as it seems that the initial step (DHCP, settings file download) does not work and that is the same for SIP and H323 phones.

To upload the new certificate is done in one minute. Tbh I only had to use one PBX where the clients register. But you can create multiple sets of ID/Secret, so I am pretty sure you can register multiple IPOs for a single domain. You can check if you get a response to your messages in Sysmon...

Firewall is set up correctly? Needed CA certificate is installed? Did it with multiple customers. Starting sometimes crappy but if it works it is fine.