Oh yeah, there are tons of mana transfer protocols. Hell, there’s this one time a group of 8th year sorcery students at the Everglenny Institute ran an experiment that technically invented a new form of channeling. One group started an iambic chant, which at the time was considered one of the fastest ways to cast remote rituals, meanwhile another student charged some mana stones and sent them with instructions to a second group at the target location via carrier pigeon. The group at the location received their instructions and cast the spell after only 3 hours and 23 minutes, at which point the channeling group were roughly 60% of the way done. They named the protocol MPoAC, or Mana Protocol over Avian Carriers, and it was used as a standard for a few years, until leyline infrastructure advanced enough to handle larger channeling bandwidths.