We have a weird issue that's been going on for a bit now. Basically some of our SIP phones don't broadcast pages through the speaker some of the time. Our Cisco UC system has an extension set for paging through both over head speakers and through a Informacast paging server the SIP phone speakers. The phones and the UC servers and Informacast server are on 1 of 3 VLANs. These 3 VLANs are configured with PIM sparse-dense mode on a Cisco4500X VSS cluster from there the phones connect to C3650's L2.
What we've been noticing is that when a page is sent, it would go across most phones expect a couple phones. The issue could occur on 1 phone and then later without any intervention it would be fine and have the page come through the speaker. Today during some tests they were all working that we could get to 15-20 phones, a person who's phone was working came over to let us know that it was know working now. Out of the phones that we tested 1 wasn't working until we reset it. We tested it a couple more time and it responded properly, Shortly after we left, the person who had mentioned their phone was working, reported that the paging wasn't working. Something that we did notice that occurred on the phones having the issue was when a page was announced the speaker and mute buttons lit up, just nothing came through the speaker even if the speaker volume was on full volume.
This system was working up end of December stably, In mid-December there were some patches made to the ESX servers the UC system is on. Then we've been getting these issue. I've been getting push back stating that these upgrades wouldn't have caused this issue and the Informacast are saying it's a network issue, but haven't really proved it. From what I can see the multicast routing is working as some of the phones are broadcasting the page through the phone speaker.
Since this is an intermittent issue, we're still doing some testing.
Any thoughts?
Thanks
John
