With the exception of activating a software upgrade (6.3 is out, but distribution halted), there is no reason to make a Daily Call. Your HR10-250 gets all of its guide data via the satellite. If getting 6.3 is your concern, I recommend you bring your box to another location to make the Daily Call.

I read one user's experience with Vonage, and he said that with the new D-Link Vonage adapter, it works every time. 

TechLore Blog

HR10-250, Samsung SIR-S4120R, SIR-S4080R, 2 Philips DSR704s (one connected to a Slingbox A/V). One box used the "Zipper"; rest used PTVnet to enable networking features.

I recommend you hack your HR10-250. You can, of course, use PTVnet, but there are other options, such as the "Zipper" (read the Underground forum at TiVo Community Forums).

You can read on how I upgraded my HR10-250 to 6.3a here. 

The other option for making a Daily Call would be to use the PPP serial method. 

TechLore Blog

HR10-250, Samsung SIR-S4120R, SIR-S4080R, 2 Philips DSR704s (one connected to a Slingbox A/V). One box used the "Zipper"; rest used PTVnet to enable networking features.