Apr 10

GVGW incompatible with Google’s Wi-Fi Calling Feature

Google recently announced a beta test of a Google Voice Wi-Fi Calling feature: https://support.google.com/voice/forum/AAAAjq5-_rMaI7m1PrV21Y/?hl=en

The announcement notes that this feature disables compability with Obihai devices. Please note that it also disables compatibility with GVGW. It appears that enabling the Wi-Fi calling feature as described in this Google support article will permanently disable your ability to use that Google Voice account with GVGW. If this changes or any workaround becomes available, this post will be updated with new information.

Dec 13

SIP registration change on Google Voice Gateway

I am setting the minimum accepted registration expiration on GVGW to 120 seconds as a trial. The gateway’s default minimum of 60 seconds had been in place since launch.

It is recommended that users set their minimum value to at least 120 seconds. UAs attempting to register with a shorter interval will get a SIP 423 “Interval too brief” response and are expected to send another registration that conforms to the server’s minimum.

This is standard SIP but not every UA implements the standard correctly. Also there could be some misconfigurations where users have set a maximum interval lower than 120 which would prevent them from registering.

A 60-second registration timer causes the client to refresh at 30 seconds, which is grossly excessive considering that the majority of devices doing this haven’t changed their IP addresses in weeks or longer. Even as a keep-alive mechanism, a 30 second refresh is unnecessary. UAs needing NAT keepalive should use the appropriate option and not abuse SIP REGISTER for that purpose.

Dec 11

Growing GVGW cluster

Two more proxies were added to the GVGW cluster. Setting strict ACLs is not recommended due to the nature of our cloud-based service. Nonetheless, here are the new IPs for your reference:

Dec 07

GVGW node added has been added to the Google Voice Gateway proxy list.

$ dig @ +short gvgw.simonics.com. a
Dec 05

GVGW node added

To handle recent growth, a new GVGW node has been added:

If you are using strict firewall or ACL rules, be sure to update your configuration for this new proxy.

Nov 09

GVGW server addition

A seventh gateway proxy was recently added: Here is the full list.

$ dig +short gvgw.simonics.com. a
Jun 11

GVGW node addition

A new node,, is being added to the Google Voice Gateway proxy list today. If you have a restrictive firewall configuration or specific ACLs, be sure to add the new node to your list.

Feb 09

GVGW node update

A new proxy node is being added to the cluster and will appear in the DNS SRV and round-robin A records shortly.

If you have firewall rules or ACLs restricting access to your SIP equipment, please add

The rest of the list:

$ dig +short gvgw.simonics.com. a