Ishindenshin

Bakudo #66:  Ishindenshin (以心伝心 lit. Telepathy) is a Kido Spell.

Description
This allows two or more practitioners to speak with each other from long distances in their mind, so that nobody else can hear it. According to Nanao, when someone is activating it on her, her head rings, similar to a phone ringing.

Incantation
''"Flutter your wings and speak to me now!" ''

Known Practitioners
Joel Goldsmith

Nanao Ise

Jushiro Ukitake

Shunsui Kyoraku