Greetings all,I'm a bit confused, a new IP Telephony deployment in a single site.PSTN is the oldest telephone network, ISDN is newer, while SIP is the latestMany articles -too many- SIP over PSTN, a fewer state SIP over ISDN, whilst some state SIP tr...

Hello, I am deploying Call Manager Express 14.1 with HA on a Cisco Router ISR 4431, do I need server modules (blades) to be added to the router? if yes, which servers are recommended? Thanking you

Greetings,A new deployment for a small/medium business (100) users.all services are hosted with a service provider, users network has IP telephony, VPN tunnel "site-to-site"all they need internet access, and video conferencing.Router should provide h...

Spoiler  Hi,Cisco ISR 4000 to be connected to inmarsat ( satellite internet) to provide voice services between a mobile station (remote) and the fixed back end (hq) over internet with encryption usin AES256 bit, there will be 16 analogue telephones, ...