We are using Zoiper 5 Pro with an asterisk 14.7 server.
Everything related to voice (SIP) calling works perfectly.
We recently decided to try the SMS capability of Zoiper5... configured it exactly as Zoiper5 documentation .. published & subscribed to presence etc. and configured the server to handle SIP SIMPLE messaging. However, any attempt to send a message gives a "Not Found (code 404)" error.
When I look in the asterisk logs, there is no trace of any messaging activity from the Zoiper5 extensions which is consistent with the 404 error. To make sure there is no DNS issue going on, we set Zoiper up using the server IP address.
It is puzzling that SIP traffic is working fine for voice but not for messaging since they both are directed at the same server.
How do I troubleshoot?