quite ok

now the app works on the iphone 3g. ive had to restart the phone.

it works without problem using the fritz!box as voip hub. the quality is quite ok but clearly not as good as the attached landline phone which uses the same voip connection. the sound is somehow metallic. ive observed this also when using isip to connect directly via the voip provider (alternative sip apps have the same problem). the email support of the app provider is really fast (within hours :-)).
------ initial problem --------
the current version 4.4 does not work on the 3g any more :-( and just ends itself while starting up (i am on a regular t-mobile/telekom rate). previous versions worked. ive even completely removed the app (to clear the settings) and reinstalled it - but to no avail.

Tocosonic about iSip -VOIP Sip Phone