I am using 3 VOIP phones connected directly to my Swisscom router (well, there is an unmanaged switch in-between): 2 Grandstream GXP2130 phones and one Cisco "dumb" VOIP phone. I've set these up 2 or 3 years ago using the SIP settings provided by the swisscom router and everything worked perfectly since then. The phones do not get automatic updates. About 1 or 2 months ago the Grandstream phones became unable to dial out. All phones can still receive calls without problem, voice is ok, etc. and the Cisco can still dial out without problem. But on the Grandstreams, now when you dial any number they instantly do a busy signal and the phone shows "NO RESPONSE" on the display. Given that I've changed nothing, and it is affecting both phones Swisscom must have changed something recently in their VOIP protocol. I don't know enough about this technology to troubleshoot it myself. Does anyone know anything about this? I tried calling support but they said they do not have support for VOIP beyond simple configuration checking on the router. Any support would be greatly appreciated.
Mehr anzeigen