In an effort to consolidate all the related discussion topics/threads, please use this thread/topic to discuss the Google Voice 503 issue as it has been reported on multiple topics in the OBiTALK forum.
Some, but not all, Google Voice users are experiencing sporadic call failures on in-bound and out-bound calling using Google Voice. The message as read back by the OBi device refers to a "503" reason message. This message indicates service provider (Google Voice) network congestion or some other network or call routing issue causing calls to not be completed. This issue is not confined just to OBi users.
If you experience this issue, it has been observed that repeated tries will oftentimes result in a successful call.
Obihai technical support are monitoring the issue and will provide new information as it becomes available.
Thank you for your support!