UPDATED: Why adding voice to LTE isn't easy

TORONTO - Adding packet-switched voice calling to LTE networks (VoLTE) is in some ways the holy grail of true 4G wireless.By enabling an all-IP based communications system, not only will it improve the quality of voice calls compared to legacy networks, VoLTE will ultimately also make network stacks simpler.But on Wednesday a consultant warned Canadian carriers about to implement VoLTE they will need to work closely with older 2G and 3G networks – which will have to handle voice calls when users drift out of LTE coverage – to get the benefits of the new technology.“The message here is new...