I see that you want to start with secondary to see if it works well. Nevertheless the correct way would be to update Primary first (through ISO upload in WebManagement as already mentioned) and from the updated primary server update the other systems.
Using any way you will.have a downtime. If...
If it's a Portwell box it is not supported.
See https://support.avaya.com/css/public/documents/101088709 (the table on top of page 9).
I prefer virtual 😉
Since Avaya does not provide Nutanix images yet (even if I heard rumors that they are evaluating this), you will not get any support and it is a bet if all will work especially after doing updates.
Usually in case of call forwarding you need one channel for the inbound call and a second call for the outbound call. Only for call forwarding, this is not possible for mobile twinning.
For call forwarding you can tell the carrier that you want to reach someone else. You will then respond...
I polled IPO in the past with SNMP. It only worked using SNMPv1. Information level is very low.
I tend to use the IPO monitoring API as it contains much more information.
I use it in Zabbix to get various information and generate alerts.
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...
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