Looks like Isai Aruvi channel is somehow tied to the STB's software or something. Earlier too, about 4 or 5 months back, customer care executives asked me to switch to Channel Number 123 (Isai Aruvi) when I requested for a channel refresh.
Before Sun News' LCN reallocation from Channel Number 112 to Channel Number 102, they used to ask us to keep the STB in Channel Number 102 (K TV) during a STB refresh.