From Telenav site:
If you answer the call, TeleNav will be operating but xxx8220;suspended.xxx8221;
After the call, press the Escape key to end the call. At this point,
TeleNav should resume from its suspended state. If you are
navigating and have gotten off the route, TeleNav will sound a
deviation jingle and obtain a new route for you.
NOTE: When TeleNav briefly uses the data network, incoming calls
may be blocked. When you are on an incoming call, TeleNav is still
running and will periodically collect a GPS fix from the internal GPS
receiver. When this fix is taken, there may be a very brief loss of
intelligibility on the received audio from the caller.
http://www.telenav.com/support/user-...700%208800.pdf