[asterisk-tech] Bad call quality.

Steve Davies steve at connection-telecom.com
Thu Jun 5 19:55:21 SAST 2008


On 5 Jun 2008, at 12:36, Edrich de Lange wrote:

> My ping times from  my asterisk servers to the voip providers are
> similar. (varies by about 20ms). the only thing that i can see be an
> issue on my connection side is the fact that to the server the route
> goes 7 hops but back it does 17.
> Both servers are on SAIX gold lines.
> Both Servers have identical hardware.


Hi,

SAIX/Telkom seems to have done something very odd to their  
International routing on ADSL.  At least for me.  Maybe that's why  
your call quality has gone down.

I've also noticed very unimpressive performance over SAIX from my house.

Routing to a wholesale provider at Telehouse over Telkom ADSL:

traceroute to iax2.magrathea.net (87.238.72.154), 64 hops max, 40 byte  
packets
  1  192.168.1.254 (192.168.1.254)  6.098 ms  3.917 ms  3.367 ms
  2  dsl-240-64-01.telkomadsl.co.za (41.240.64.1)  17.245 ms  18.075  
ms  18.847 ms
  3  196.43.35.57 (196.43.35.57)  13.450 ms  15.375 ms  18.413 ms
  4  196.43.35.57 (196.43.35.57)  16.464 ms  16.263 ms  13.725 ms
  5  196.43.33.2 (196.43.33.2)  33.386 ms  36.728 ms  38.660 ms
  6  196.43.33.5 (196.43.33.5)  34.674 ms  32.245 ms  38.624 ms
  7  hkg-ip-dir-hongkong-pos-2-1.telkom-ipnet.co.za (196.43.9.210)   
218.414 ms  217.302 ms  218.095 ms
  8  if-13-30.icore1.HK2-HongKong.teleglobe.net (116.0.93.25)  225.914  
ms  213.681 ms  213.801 ms
  9  Vlan32.icore1.S9U-Singapore.teleglobe.net (116.0.83.1)  251.421  
ms  351.368 ms if-11-0-0-31.core3.HK2-HongKong.teleglobe.net  
(116.0.82.17)  217.987 ms
10  if-11-0-0-731.core1.S9R-Singapore.teleglobe.net (116.0.82.22)   
247.804 ms if-11-0-0-36.core1.S9R-Singapore.Teleglobe.net  
(209.58.82.65)  319.932 ms if-11-0-0-731.core1.S9R- 
Singapore.teleglobe.net (116.0.82.22)  408.846 ms
11  if-3-0-1.core1.CFO-Chennai.teleglobe.net (116.0.79.5)  307.971 ms   
282.793 ms  326.130 ms
12  if-0-0-0.core2.CFO-Chennai.teleglobe.net (116.0.84.1)  280.035 ms   
385.074 ms  363.427 ms
13  if-1-0-0.core2.COV-Cochin.teleglobe.net (116.0.86.1)  298.780 ms   
343.955 ms  300.047 ms
14  if-0-0-0.core1.COV-Cochin.teleglobe.net (116.0.85.1)  416.003 ms   
296.573 ms  300.300 ms
15  if-4-0-0.core1.MLV-Mumbai.teleglobe.net (209.58.105.37)  425.945  
ms  332.429 ms  384.227 ms
16  195.219.195.109 (195.219.195.109)  614.514 ms  511.926 ms  511.209  
ms
17  195.219.195.18 (195.219.195.18)  511.132 ms  496.451 ms  517.623 ms
18  if-5-0-0.bb1.LDN-London.Teleglobe.net (195.219.96.21)  511.728 ms   
509.902 ms  512.239 ms
19  195.219.212.10 (195.219.212.10)  614.324 ms  580.276 ms  529.085 ms
20  kings-brs-magrathea-lon.magrathea.net.uk (87.238.72.210)  595.520  
ms  567.357 ms  512.673 ms
21  brs-asterisk-1.magrathea.net.uk (87.238.72.154)  611.845 ms   
615.386 ms  613.616 ms

--- iax2.magrathea.net ping statistics ---
20 packets transmitted, 20 packets received, 0% packet loss
round-trip min/avg/max/stddev = 513.327/573.895/625.539/32.732 ms

So Telkom has decided to reach London by sending traffic via Hong  
Kong, Singapore, India,...


By comparison, the same destination via Verizon's network:

traceroute to brs-asterisk-1.magrathea.net.uk (87.238.72.154), 30 hops  
max, 52 byte packets
  1  41.204.210.195 (41.204.210.195)  0.441 ms  0.203 ms  0.245 ms
  2  41.204.193.116 (41.204.193.116)  0.244 ms  0.449 ms  0.245 ms
  3  vlan615.hr3.cpt1.alter.net (196.30.77.73)  0.473 ms  0.480 ms   
0.728 ms
  4  pc3.gw2.cpt1.alter.net (196.30.176.34)  0.735 ms  1.483 ms  1.246  
ms
  5  srp5-0-0.cr2.cpt1.alter.net (196.31.249.69)  0.993 ms  0.736 ms   
0.741 ms
  6  other-side.s6-1-1.cr2.cpt1.alter.net (196.30.229.221)  165.147  
ms  163.131 ms  156.375 ms
  7  so0-0-0.ir1.lnd19.alter.net (196.30.229.182)  163.408 ms  
at0-1-1.ir1.lnd19.alter.net (196.30.229.134)  164.124 ms  
so0-0-0.ir1.lnd19.alter.net (196.30.229.182)  163.868 ms
  8  so-3-0-1.IH2.LND9.ALTER.NET (146.188.3.49)  163.643 ms  152.353  
ms  163.381 ms
  9  so-5-1-0.TL1.LND9.ALTER.NET (146.188.2.45)  153.390 ms  164.864  
ms  164.121 ms
10  so-0-0-0.XR1.LND9.ALTER.NET (146.188.15.234)  154.157 ms  164.364  
ms  152.628 ms
11  POS7-2.CR1.LND10.ALTER.NET (158.43.150.97)  168.375 ms  155.114  
ms  153.387 ms
12  POS7-0.CR1.LND8.ALTER.NET (158.43.254.58)  167.123 ms  159.383 ms   
154.114 ms
13  POS4-0-0.CR1.BRS1.ALTER.NET (158.43.254.181)  172.144 ms  163.877  
ms  160.379 ms
14  FastEthernet0-0-0.GW5.BRS1.ALTER.net (158.43.145.71)  176.638 ms   
163.363 ms  162.630 ms
15  uuk202134.uk.customer.alter.net (158.43.39.2)  161.644 ms  174.115  
ms  162.347 ms
16  brs-asterisk-1.magrathea.net.uk (87.238.72.154)  174.610 ms   
175.347 ms  175.877 ms


--- iax2.magrathea.net ping statistics ---
20 packets transmitted, 20 received, 0% packet loss, time 19024ms
rtt min/avg/max/mdev = 161.847/168.019/176.783/5.564 ms


So it looks like your questions needed to be addressed to Telkom...

Where are you routing to? - I'll have a look how it looks from our POPs.

Regards,
Steve



More information about the tech mailing list