Asterisk Error with Google Voice

I’m getting the following error when trying to forward a call to a regular cell number using my outgoing Google Voice account:

[Dec 11 10:27:12] ERROR[12096][C-00000000]: chan_motif.c:1777 jingle_request: Unable to create Jingle session on endpoint 'google' as no valid connection exists [Dec 11 10:27:12] WARNING[12096][C-00000000]: app_dial.c:2437 dial_exec_full: Unable to create channel of type 'Motif' (cause 42 - Switching equipment congestion)

Any suggestions/hints? Thanks!