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The security of the call is based on a digital certificate verification on the SIP/TLS server. If a certificate error appears check whether the date of your phone is correct. If the date is correct it is possible that the certificate is wrong, misconfigured or expired or that your phone is undergoing a security attack. In these cases always contact your system administrator. |
Sending a Private Message PrivateGSM
You can also communicate by text messages using the Private Message System (henceforth PMS). PMS provides Private Text Messages (henceforth PTM) which do relay on the very same security infrastructure the voice calls do.
PTM are available as a sussidiary communication system which is a sort of voice expansion feature.
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You cannot directly send a PTM to a contact of choice. It's necessary for you and the contact you want to write to to have had a previous call. |
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Actually it's not possible to use PMS in order to chat with multiple people (ie it's not possible to create chat rooms). |