![]() ![]() The good news is that RabbitRun can solve this issue and many other network issues that affect quality of service. Outbound traffic appears to be unaffected. This limit is global to all inbound port-5060 packets transiting the cable modem, not session or IP-scoped in any way. Spectrum is rate-limiting any inbound ip4 packets with a source or destination port of 5060, both UDP and TCP. After performing extensive tests which he describes in detail, he concludes that: He went the extra mile to dig deep in search of the root cause. ![]() Unlike many posters on this forum however, Cheeseblock27494356 was not content to simply gripe about the problem. The more phones, the more SIP traffic, and the worse the problem gets. Anything past 10 phones causes all of them to constantly lose their registration. With less than 4 phones I can’t trigger the issue at all because there isn’t enough SIP traffic. Extensive testing shows I can get about 7 of our Yealink phones registered with the SIP server, as long as I stagger their initial connections. Spectrum broke everything the phones started failing registration and no calls were possible. The post was made on the VoIP subreddit – an online forum used by nearly 30,000 networking professionals to discuss problems related to VoIP. Network engineer and Reddittor Cheeseblock27494356 recently posted about problems he has encountered with VoIP quality of service when using Spectrum internet, and specifically DOCSIS modem models Sercomm ES2251 and Sagemcom RAC2V1S. ![]()
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