question

Ben Goerz avatar image
Ben Goerz asked ·

SIP Latency & Packet Loss

Anyone else seeing high latency and packet loss to RingCentral's SIP servers? From multiple locations in DFW, I am seeing >1000ms ping times with high variation and up to 75% packet loss.


Sample:
root: ping -c 4 sip212.ringcentral.com
PING sip212.ringcentral.com (199.255.120.165): 56 data bytes
64 bytes from 199.255.120.165: icmp_seq=0 ttl=52 time=1499.491 ms
64 bytes from 199.255.120.165: icmp_seq=1 ttl=52 time=821.052 ms
64 bytes from 199.255.120.165: icmp_seq=2 ttl=52 time=1467.823 ms
64 bytes from 199.255.120.165: icmp_seq=3 ttl=52 time=1237.629 ms

--- sip212.ringcentral.com ping statistics ---
4 packets transmitted, 4 packets received, 0.0% packet loss
round-trip min/avg/max/stddev = 821.052/1256.499/1499.491/270.958 ms


root: ping -c 4 sip214.ringcentral.com
PING sip214.ringcentral.com (199.255.120.169): 56 data bytes
64 bytes from 199.255.120.169: icmp_seq=0 ttl=52 time=1606.821 ms
64 bytes from 199.255.120.169: icmp_seq=1 ttl=52 time=961.692 ms
64 bytes from 199.255.120.169: icmp_seq=2 ttl=52 time=1574.362 ms

--- sip214.ringcentral.com ping statistics ---
4 packets transmitted, 3 packets received, 25.0% packet loss
round-trip min/avg/max/stddev = 961.692/1380.958/1606.821/296.762 ms


root: ping -c 4 sip216.ringcentral.com
PING sip216.ringcentral.com (199.255.120.173): 56 data bytes
64 bytes from 199.255.120.173: icmp_seq=2 ttl=52 time=1602.908 ms

--- sip216.ringcentral.com ping statistics ---
4 packets transmitted, 1 packets received, 75.0% packet loss
round-trip min/avg/max/stddev = 1602.908/1602.908/1602.908/0.000 ms


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erik-antoniuk avatar image
erik-antoniuk answered ·
Congestion can be a variety of factors such as activity on your network, your ISP and the quality of the last mile, RC and their carriers.
  
Ping a good diagnostic tool cannot accurately test congestion for RTP (voice) packets since QoS would be moving RTP packets to the front to the queue. Ping which uses ICMP would not meet the QoS tags.


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Scott Leary avatar image
Scott Leary answered ·
I am having the exact same problem, but I'm not sure if it's related to my ISP, Time Warner Cable or not. I also live in DFW
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satsisfact avatar image
satsisfact answered ·
Now when you are plugged directly into the modem and you see errors it will depend on the pattern you see. If you get a packet here and there that is dropped or gets high latency then it could just be how ping works. Ping (ie icmp) is considered low priority traffic by devices. If the ISP router is busy passing actually traffic when you ping comes in it will delay responding since passing real traffic is much more important and sometime it does not respond at all if it is too busy.   If you are seeing say greater than 1 or 2% of the packets with errors then you can call the ISP and have them check the line. A indication there is a problem generally is groups of ping packets that have problems not just one here and there . If you want to test ping for website or ip, use   http://www.whoisxy.com/
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