Can anyone confirm successful multicast “page all” functionality with Grandstream GXP-2130 and GXP-2160 phones? I’m experiencing horrible audio quality that sounds like very rapid audio drop outs and renders the page unintelligible. I’m testing using only 2-3 phones connected to the network. Paging using page groups works fine and produces very clear audio but ultimately, I need to be able to page over 90 endpoints so regular page groups aren’t an option.
I’m currently using Asterisk 13.2.0 with FreePBX 12.0.51. I have posted on the FreePBX forums and received a couple of helpful suggestions including how to confirm that Asterisk is using the ulaw codec during multicast paging (it is) but I think that’s run its course. At this point it’s not clear whether this is a phone issue, a configuration issue, or something related to Asterisk and I’m hoping someone can help shed some light or has suggestions on how to best troubleshoot this.
Thanks – Steve