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For most this is not an issue when they have high speed internet access, however, it can become a problem with satellite links or any other system where unusually long distances and many hops are involved.
On private networks, there is rarely a problem using VoIP and many companies with internal networks (such as telcos and power companies) use VoIP to communicate within their organizational network structure.
However, when available end-to-end bandwidth is less than 256 Kbps, a good VoIP system will require mechanisms to overcome fragmentation of data stream.
Security is an issue everywhere on internet and what this means is that VoIP also needs to deal with firewalls and NATs (Network Address Translation). While some systems can do NAT and firewall traversal on their own, others require use of SBCs (Session Border Controllers) to manage traversal.
One major, though non-technical, challenge to VoIP, comes from traditional telephone service providers who are being by-passed by consumers who love extremely low (or zero) long-distance charges they can get by using VoIP. Exactly how this works out over long run will be fascinating to watch. In meantime, VoIP services are continually being improved and extended. Enjoy them.
For more on VoIP, conference calling, web conferencing and more visit http://www.AltaGlobal.com. Find more on wireless and cellular subjects at http://www.AltaGlobal.org. For networking and security check