IP range of 10-12-09 and 84-26 need to be in the same range -
ie: 10-12-09 could be 192.168.0.10 and then 84-26 could be 192.168.0.11
If 84-26 is still default 172.16.0.20, then you'd get one-way speech or even no speech at all...
Are you using different SIP Profiles and or different Trunk Access Maps?
Another thing to look at may be the timers for outgoing calls - 21-01:02 and 2101:03 (Interdigit timers). Sometimes if they are too short, could cause outgoing call problems, even on some analogue lines. Default timers are...
Hackers normally scan IP's for the most common open ports.
You can delete any unused extension ports and password-protect any SIP Extensions currently in use. This will ensure that the hackers cannot register to any other "available" extensions/ports...
Only version I currently have is: (EMEA/EU versions)
PCPro - v2.20.00 - https://mega.nz/file/4RAWhbDI#cWmcwmaG34MPwmknPc8KMcvWUemDUGFd2JmpHP1xyOM
Firmware - v2.20.00 - https://mega.nz/file/NIIGxb7b#omxAYbHRH5FSByXllnBymobAU2P6kXGwhkDPj9iTxZU
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