[Asterisk-Users] MTU and Voice Delay (latency??)

Geoff Manning gmanning at zoom.com
Tue Jan 10 09:03:35 MST 2006 

Rusty Dekema wrote:
> How far (physically) is the Asterisk server location from the
> location of the phones? Have you tried pinging the Asterisk server
> from the network to which the phones are connected?  
> 
> As a rule of thumb, If the two sites are within 2500 miles of each
> other and the network connection between them is working properly,
> the round trip time for a 64 byte ping should be less than 100 ms,
> the round trip time should not vary from one ping to another by more
> than 2-5 ms (typical), and there should be virtually no dropped
> packets (well under 0.1%).     

The two locations are in Greater London

Here is a traceroute from the Modem to the Asterisk Server (64byte packets)

ttl=1	82.152.192.1	10 ms	|<10 ms	|<10 ms	
ttl=2	81.5.191.177	|<10 ms	|<10 ms	|<10 ms	
ttl=3	212.187.151.157	|<10 ms	|<10 ms	|<10 ms	
ttl=4	212.113.3.25	|<10 ms	40 ms	|<10 ms	
ttl=5	212.187.131.161	|<10 ms	|<10 ms	|<10 ms	
ttl=6	212.187.128.46	10 ms	
ttl=6	4.68.128.110	|<10 ms	
ttl=6	212.187.128.46	10 ms	
ttl=7	212.187.129.165	|<10 ms	
ttl=7	212.187.129.197	|<10 ms	
ttl=7	212.187.129.181	|<10 ms	
ttl=8	195.50.117.134	10 ms	|<10 ms	|<10 ms	
ttl=9	69.64.163.17	|<10 ms	|<10 ms	|<10 ms	


Here is the ping output (64byte packets): 

Where useconds = ms * 1000 (I think)

72 bytes from 69.64.163.17: icmp_seq=0 time=9249 us
72 bytes from 69.64.163.17: icmp_seq=1 time=8772 us
72 bytes from 69.64.163.17: icmp_seq=2 time=8102 us
72 bytes from 69.64.163.17: icmp_seq=3 time=8214 us
72 bytes from 69.64.163.17: icmp_seq=4 time=8143 us
72 bytes from 69.64.163.17: icmp_seq=5 time=8090 us
72 bytes from 69.64.163.17: icmp_seq=6 time=8241 us
72 bytes from 69.64.163.17: icmp_seq=7 time=8187 us
72 bytes from 69.64.163.17: icmp_seq=8 time=8730 us
72 bytes from 69.64.163.17: icmp_seq=9 time=8018 us
72 bytes from 69.64.163.17: icmp_seq=10 time=8559 us
72 bytes from 69.64.163.17: icmp_seq=11 time=7906 us
72 bytes from 69.64.163.17: icmp_seq=12 time=8036 us
72 bytes from 69.64.163.17: icmp_seq=13 time=9195 us
72 bytes from 69.64.163.17: icmp_seq=14 time=9145 us
72 bytes from 69.64.163.17: icmp_seq=15 time=10200 us
72 bytes from 69.64.163.17: icmp_seq=16 time=7975 us
72 bytes from 69.64.163.17: icmp_seq=17 time=8138 us
72 bytes from 69.64.163.17: icmp_seq=18 time=8357 us
72 bytes from 69.64.163.17: icmp_seq=19 time=8733 us
72 bytes from 69.64.163.17: icmp_seq=20 time=8445 us
72 bytes from 69.64.163.17: icmp_seq=21 time=9225 us
72 bytes from 69.64.163.17: icmp_seq=22 time=8879 us
72 bytes from 69.64.163.17: icmp_seq=23 time=9121 us
72 bytes from 69.64.163.17: icmp_seq=24 time=9292 us
72 bytes from 69.64.163.17: icmp_seq=25 time=8195 us
72 bytes from 69.64.163.17: icmp_seq=26 time=8545 us
72 bytes from 69.64.163.17: icmp_seq=27 time=8403 us
72 bytes from 69.64.163.17: icmp_seq=28 time=8591 us
72 bytes from 69.64.163.17: icmp_seq=29 time=9554 us
72 bytes from 69.64.163.17: icmp_seq=30 time=7852 us
72 bytes from 69.64.163.17: icmp_seq=31 time=8398 us
72 bytes from 69.64.163.17: icmp_seq=32 time=10150 us
72 bytes from 69.64.163.17: icmp_seq=33 time=7954 us
72 bytes from 69.64.163.17: icmp_seq=34 time=8309 us
72 bytes from 69.64.163.17: icmp_seq=35 time=8888 us
72 bytes from 69.64.163.17: icmp_seq=36 time=8208 us
72 bytes from 69.64.163.17: icmp_seq=37 time=9043 us
72 bytes from 69.64.163.17: icmp_seq=38 time=10129 us
72 bytes from 69.64.163.17: icmp_seq=39 time=8095 us
72 bytes from 69.64.163.17: icmp_seq=40 time=9500 us
72 bytes from 69.64.163.17: icmp_seq=41 time=8626 us
72 bytes from 69.64.163.17: icmp_seq=42 time=8975 us
72 bytes from 69.64.163.17: icmp_seq=43 time=8883 us
72 bytes from 69.64.163.17: icmp_seq=44 time=9045 us
72 bytes from 69.64.163.17: icmp_seq=45 time=8145 us
72 bytes from 69.64.163.17: icmp_seq=46 time=8707 us
72 bytes from 69.64.163.17: icmp_seq=47 time=8186 us
72 bytes from 69.64.163.17: icmp_seq=48 time=11648 us
72 bytes from 69.64.163.17: icmp_seq=49 time=11705 us
72 bytes from 69.64.163.17: icmp_seq=50 time=8200 us
72 bytes from 69.64.163.17: icmp_seq=51 time=8763 us
72 bytes from 69.64.163.17: icmp_seq=52 time=11047 us
72 bytes from 69.64.163.17: icmp_seq=53 time=8319 us
72 bytes from 69.64.163.17: icmp_seq=54 time=8228 us
72 bytes from 69.64.163.17: icmp_seq=55 time=8173 us
72 bytes from 69.64.163.17: icmp_seq=56 time=8960 us
72 bytes from 69.64.163.17: icmp_seq=57 time=7969 us
72 bytes from 69.64.163.17: icmp_seq=58 time=8594 us
72 bytes from 69.64.163.17: icmp_seq=59 time=8117 us
72 bytes from 69.64.163.17: icmp_seq=60 time=8897 us
72 bytes from 69.64.163.17: icmp_seq=61 time=8242 us
72 bytes from 69.64.163.17: icmp_seq=62 time=8224 us
72 bytes from 69.64.163.17: icmp_seq=63 time=8361 us
72 bytes from 69.64.163.17: icmp_seq=64 time=8515 us
72 bytes from 69.64.163.17: icmp_seq=65 time=8251 us
72 bytes from 69.64.163.17: icmp_seq=66 time=7826 us
72 bytes from 69.64.163.17: icmp_seq=67 time=8936 us
72 bytes from 69.64.163.17: icmp_seq=68 time=8249 us
72 bytes from 69.64.163.17: icmp_seq=69 time=8821 us
72 bytes from 69.64.163.17: icmp_seq=70 time=8134 us
72 bytes from 69.64.163.17: icmp_seq=71 time=8781 us
72 bytes from 69.64.163.17: icmp_seq=72 time=8299 us
72 bytes from 69.64.163.17: icmp_seq=73 time=8028 us
72 bytes from 69.64.163.17: icmp_seq=74 time=10186 us
72 bytes from 69.64.163.17: icmp_seq=75 time=8137 us
72 bytes from 69.64.163.17: icmp_seq=76 time=9527 us
72 bytes from 69.64.163.17: icmp_seq=77 time=8446 us
72 bytes from 69.64.163.17: icmp_seq=78 time=8379 us
72 bytes from 69.64.163.17: icmp_seq=79 time=9164 us
72 bytes from 69.64.163.17: icmp_seq=80 time=8285 us
72 bytes from 69.64.163.17: icmp_seq=81 time=14911 us
72 bytes from 69.64.163.17: icmp_seq=82 time=9286 us
72 bytes from 69.64.163.17: icmp_seq=83 time=8393 us
72 bytes from 69.64.163.17: icmp_seq=84 time=9171 us
72 bytes from 69.64.163.17: icmp_seq=85 time=8279 us
72 bytes from 69.64.163.17: icmp_seq=86 time=7796 us
72 bytes from 69.64.163.17: icmp_seq=87 time=8519 us
72 bytes from 69.64.163.17: icmp_seq=88 time=9483 us
72 bytes from 69.64.163.17: icmp_seq=89 time=8608 us
72 bytes from 69.64.163.17: icmp_seq=90 time=7914 us
72 bytes from 69.64.163.17: icmp_seq=91 time=10575 us
72 bytes from 69.64.163.17: icmp_seq=92 time=7842 us
72 bytes from 69.64.163.17: icmp_seq=93 time=8591 us
72 bytes from 69.64.163.17: icmp_seq=94 time=8321 us
72 bytes from 69.64.163.17: icmp_seq=95 time=8269 us
72 bytes from 69.64.163.17: icmp_seq=96 time=8012 us
72 bytes from 69.64.163.17: icmp_seq=97 time=12541 us
72 bytes from 69.64.163.17: icmp_seq=98 time=10270 us
72 bytes from 69.64.163.17: icmp_seq=99 time=12235 us
72 bytes from 69.64.163.17: icmp_seq=100 time=9665 us
72 bytes from 69.64.163.17: icmp_seq=101 time=8358 us
72 bytes from 69.64.163.17: icmp_seq=102 time=9679 us
72 bytes from 69.64.163.17: icmp_seq=103 time=8185 us
72 bytes from 69.64.163.17: icmp_seq=104 time=8533 us
72 bytes from 69.64.163.17: icmp_seq=105 time=8082 us
72 bytes from 69.64.163.17: icmp_seq=106 time=8409 us
72 bytes from 69.64.163.17: icmp_seq=107 time=8556 us
72 bytes from 69.64.163.17: icmp_seq=108 time=9487 us
72 bytes from 69.64.163.17: icmp_seq=109 time=8231 us
72 bytes from 69.64.163.17: icmp_seq=110 time=7994 us
72 bytes from 69.64.163.17: icmp_seq=111 time=8508 us
72 bytes from 69.64.163.17: icmp_seq=112 time=8295 us
72 bytes from 69.64.163.17: icmp_seq=113 time=8178 us
72 bytes from 69.64.163.17: icmp_seq=114 time=9436 us
72 bytes from 69.64.163.17: icmp_seq=115 time=8941 us
72 bytes from 69.64.163.17: icmp_seq=116 time=8452 us
72 bytes from 69.64.163.17: icmp_seq=117 time=8592 us
72 bytes from 69.64.163.17: icmp_seq=118 time=8321 us
72 bytes from 69.64.163.17: icmp_seq=119 time=9515 us
72 bytes from 69.64.163.17: icmp_seq=120 time=7990 us
72 bytes from 69.64.163.17: icmp_seq=121 time=9213 us
72 bytes from 69.64.163.17: icmp_seq=122 time=7914 us
72 bytes from 69.64.163.17: icmp_seq=123 time=8258 us
72 bytes from 69.64.163.17: icmp_seq=124 time=7998 us
72 bytes from 69.64.163.17: icmp_seq=125 time=8165 us
72 bytes from 69.64.163.17: icmp_seq=126 time=7912 us
72 bytes from 69.64.163.17: icmp_seq=127 time=8236 us
72 bytes from 69.64.163.17: icmp_seq=128 time=8380 us
72 bytes from 69.64.163.17: icmp_seq=129 time=9493 us
72 bytes from 69.64.163.17: icmp_seq=130 time=8316 us
72 bytes from 69.64.163.17: icmp_seq=131 time=8048 us
72 bytes from 69.64.163.17: icmp_seq=132 time=8013 us
72 bytes from 69.64.163.17: icmp_seq=133 time=8983 us
72 bytes from 69.64.163.17: icmp_seq=134 time=8143 us
72 bytes from 69.64.163.17: icmp_seq=135 time=8507 us
72 bytes from 69.64.163.17: icmp_seq=136 time=8240 us
72 bytes from 69.64.163.17: icmp_seq=137 time=9031 us
72 bytes from 69.64.163.17: icmp_seq=138 time=8343 us
72 bytes from 69.64.163.17: icmp_seq=139 time=8335 us
72 bytes from 69.64.163.17: icmp_seq=140 time=8443 us
72 bytes from 69.64.163.17: icmp_seq=141 time=8080 us
72 bytes from 69.64.163.17: icmp_seq=142 time=8242 us
72 bytes from 69.64.163.17: icmp_seq=143 time=8156 us
72 bytes from 69.64.163.17: icmp_seq=144 time=8010 us
72 bytes from 69.64.163.17: icmp_seq=145 time=8170 us
72 bytes from 69.64.163.17: icmp_seq=146 time=7856 us
72 bytes from 69.64.163.17: icmp_seq=147 time=7995 us
72 bytes from 69.64.163.17: icmp_seq=148 time=8520 us
72 bytes from 69.64.163.17: icmp_seq=149 time=8969 us
72 bytes from 69.64.163.17: icmp_seq=150 time=7870 us
72 bytes from 69.64.163.17: icmp_seq=151 time=8089 us
72 bytes from 69.64.163.17: icmp_seq=152 time=8186 us
72 bytes from 69.64.163.17: icmp_seq=153 time=8627 us
72 bytes from 69.64.163.17: icmp_seq=154 time=8334 us
72 bytes from 69.64.163.17: icmp_seq=155 time=8433 us
72 bytes from 69.64.163.17: icmp_seq=156 time=8007 us
72 bytes from 69.64.163.17: icmp_seq=157 time=8155 us
72 bytes from 69.64.163.17: icmp_seq=158 time=8465 us
72 bytes from 69.64.163.17: icmp_seq=159 time=8249 us
72 bytes from 69.64.163.17: icmp_seq=160 time=7986 us
72 bytes from 69.64.163.17: icmp_seq=161 time=8538 us
72 bytes from 69.64.163.17: icmp_seq=162 time=8276 us
72 bytes from 69.64.163.17: icmp_seq=163 time=9040 us
72 bytes from 69.64.163.17: icmp_seq=164 time=8161 us
72 bytes from 69.64.163.17: icmp_seq=165 time=9332 us
72 bytes from 69.64.163.17: icmp_seq=166 time=8056 us
72 bytes from 69.64.163.17: icmp_seq=167 time=8393 us
72 bytes from 69.64.163.17: icmp_seq=168 time=8592 us
72 bytes from 69.64.163.17: icmp_seq=169 time=8766 us
72 bytes from 69.64.163.17: icmp_seq=170 time=8478 us
72 bytes from 69.64.163.17: icmp_seq=171 time=9046 us
72 bytes from 69.64.163.17: icmp_seq=172 time=8163 us
72 bytes from 69.64.163.17: icmp_seq=173 time=7953 us
72 bytes from 69.64.163.17: icmp_seq=174 time=8053 us
72 bytes from 69.64.163.17: icmp_seq=175 time=8448 us
72 bytes from 69.64.163.17: icmp_seq=176 time=8218 us
72 bytes from 69.64.163.17: icmp_seq=177 time=8616 us
72 bytes from 69.64.163.17: icmp_seq=178 time=8048 us
72 bytes from 69.64.163.17: icmp_seq=179 time=7792 us
72 bytes from 69.64.163.17: icmp_seq=180 time=8137 us
72 bytes from 69.64.163.17: icmp_seq=181 time=7875 us
72 bytes from 69.64.163.17: icmp_seq=182 time=9696 us
72 bytes from 69.64.163.17: icmp_seq=183 time=7990 us
72 bytes from 69.64.163.17: icmp_seq=184 time=8138 us
72 bytes from 69.64.163.17: icmp_seq=185 time=7878 us
72 bytes from 69.64.163.17: icmp_seq=186 time=8228 us
72 bytes from 69.64.163.17: icmp_seq=187 time=7766 us
72 bytes from 69.64.163.17: icmp_seq=188 time=8699 us
72 bytes from 69.64.163.17: icmp_seq=189 time=8258 us
72 bytes from 69.64.163.17: icmp_seq=190 time=9333 us
72 bytes from 69.64.163.17: icmp_seq=191 time=10335 us
72 bytes from 69.64.163.17: icmp_seq=192 time=7852 us
72 bytes from 69.64.163.17: icmp_seq=193 time=7792 us
72 bytes from 69.64.163.17: icmp_seq=194 time=8536 us
72 bytes from 69.64.163.17: icmp_seq=195 time=7866 us
72 bytes from 69.64.163.17: icmp_seq=196 time=8633 us
72 bytes from 69.64.163.17: icmp_seq=197 time=8528 us
72 bytes from 69.64.163.17: icmp_seq=198 time=8476 us
72 bytes from 69.64.163.17: icmp_seq=199 time=8426 us
72 bytes from 69.64.163.17: icmp_seq=200 time=7953 us
72 bytes from 69.64.163.17: icmp_seq=201 time=8531 us
72 bytes from 69.64.163.17: icmp_seq=202 time=8294 us
72 bytes from 69.64.163.17: icmp_seq=203 time=7887 us
72 bytes from 69.64.163.17: icmp_seq=204 time=8212 us
72 bytes from 69.64.163.17: icmp_seq=205 time=9620 us
72 bytes from 69.64.163.17: icmp_seq=206 time=8036 us
72 bytes from 69.64.163.17: icmp_seq=207 time=7990 us
72 bytes from 69.64.163.17: icmp_seq=208 time=8532 us
72 bytes from 69.64.163.17: icmp_seq=209 time=8716 us
72 bytes from 69.64.163.17: icmp_seq=210 time=8422 us
72 bytes from 69.64.163.17: icmp_seq=211 time=9156 us
72 bytes from 69.64.163.17: icmp_seq=212 time=8264 us
72 bytes from 69.64.163.17: icmp_seq=213 time=7754 us
72 bytes from 69.64.163.17: icmp_seq=214 time=8078 us
72 bytes from 69.64.163.17: icmp_seq=215 time=8449 us
72 bytes from 69.64.163.17: icmp_seq=216 time=8470 us
72 bytes from 69.64.163.17: icmp_seq=217 time=8463 us
72 bytes from 69.64.163.17: icmp_seq=218 time=8560 us
72 bytes from 69.64.163.17: icmp_seq=219 time=9057 us
72 bytes from 69.64.163.17: icmp_seq=220 time=12960 us
72 bytes from 69.64.163.17: icmp_seq=221 time=8532 us
72 bytes from 69.64.163.17: icmp_seq=222 time=8411 us
72 bytes from 69.64.163.17: icmp_seq=223 time=7938 us
72 bytes from 69.64.163.17: icmp_seq=224 time=8320 us
72 bytes from 69.64.163.17: icmp_seq=225 time=8039 us
72 bytes from 69.64.163.17: icmp_seq=226 time=8192 us
72 bytes from 69.64.163.17: icmp_seq=227 time=8766 us
72 bytes from 69.64.163.17: icmp_seq=228 time=8277 us
72 bytes from 69.64.163.17: icmp_seq=229 time=8223 us
72 bytes from 69.64.163.17: icmp_seq=230 time=8064 us
72 bytes from 69.64.163.17: icmp_seq=231 time=8338 us
72 bytes from 69.64.163.17: icmp_seq=232 time=9572 us
72 bytes from 69.64.163.17: icmp_seq=233 time=9077 us
72 bytes from 69.64.163.17: icmp_seq=234 time=8361 us
72 bytes from 69.64.163.17: icmp_seq=235 time=8066 us
72 bytes from 69.64.163.17: icmp_seq=236 time=9243 us
72 bytes from 69.64.163.17: icmp_seq=237 time=8156 us
72 bytes from 69.64.163.17: icmp_seq=238 time=8294 us
72 bytes from 69.64.163.17: icmp_seq=239 time=8681 us
72 bytes from 69.64.163.17: icmp_seq=240 time=8191 us
72 bytes from 69.64.163.17: icmp_seq=241 time=8332 us
72 bytes from 69.64.163.17: icmp_seq=242 time=8083 us
72 bytes from 69.64.163.17: icmp_seq=243 time=8227 us
72 bytes from 69.64.163.17: icmp_seq=244 time=8318 us
72 bytes from 69.64.163.17: icmp_seq=245 time=8277 us
72 bytes from 69.64.163.17: icmp_seq=246 time=8201 us
72 bytes from 69.64.163.17: icmp_seq=247 time=11682 us
72 bytes from 69.64.163.17: icmp_seq=248 time=8303 us
72 bytes from 69.64.163.17: icmp_seq=249 time=7857 us
72 bytes from 69.64.163.17: icmp_seq=250 time=8003 us
72 bytes from 69.64.163.17: icmp_seq=251 time=8139 us
72 bytes from 69.64.163.17: icmp_seq=252 time=8511 us
72 bytes from 69.64.163.17: icmp_seq=253 time=8641 us
72 bytes from 69.64.163.17: icmp_seq=254 time=8329 us
72 bytes from 69.64.163.17: icmp_seq=255 time=8277 us
72 bytes from 69.64.163.17: icmp_seq=256 time=8218 us
72 bytes from 69.64.163.17: icmp_seq=257 time=8151 us
72 bytes from 69.64.163.17: icmp_seq=258 time=8510 us
72 bytes from 69.64.163.17: icmp_seq=259 time=7839 us
72 bytes from 69.64.163.17: icmp_seq=260 time=8975 us
72 bytes from 69.64.163.17: icmp_seq=261 time=8404 us
72 bytes from 69.64.163.17: icmp_seq=262 time=8905 us
72 bytes from 69.64.163.17: icmp_seq=263 time=8785 us
72 bytes from 69.64.163.17: icmp_seq=264 time=7838 us
72 bytes from 69.64.163.17: icmp_seq=265 time=8600 us
72 bytes from 69.64.163.17: icmp_seq=266 time=7924 us
72 bytes from 69.64.163.17: icmp_seq=267 time=8342 us
72 bytes from 69.64.163.17: icmp_seq=268 time=9071 us
72 bytes from 69.64.163.17: icmp_seq=269 time=8187 us
72 bytes from 69.64.163.17: icmp_seq=270 time=8319 us
72 bytes from 69.64.163.17: icmp_seq=271 time=8268 us
72 bytes from 69.64.163.17: icmp_seq=272 time=8206 us
72 bytes from 69.64.163.17: icmp_seq=273 time=8585 us
72 bytes from 69.64.163.17: icmp_seq=274 time=8124 us
72 bytes from 69.64.163.17: icmp_seq=275 time=8266 us
72 bytes from 69.64.163.17: icmp_seq=276 time=8608 us
72 bytes from 69.64.163.17: icmp_seq=277 time=8981 us
72 bytes from 69.64.163.17: icmp_seq=278 time=8597 us
72 bytes from 69.64.163.17: icmp_seq=279 time=10618 us
72 bytes from 69.64.163.17: icmp_seq=280 time=8504 us
72 bytes from 69.64.163.17: icmp_seq=281 time=7992 us
72 bytes from 69.64.163.17: icmp_seq=282 time=7957 us
72 bytes from 69.64.163.17: icmp_seq=283 time=8360 us
72 bytes from 69.64.163.17: icmp_seq=284 time=8112 us
72 bytes from 69.64.163.17: icmp_seq=285 time=8840 us
72 bytes from 69.64.163.17: icmp_seq=286 time=7957 us
72 bytes from 69.64.163.17: icmp_seq=287 time=8496 us
72 bytes from 69.64.163.17: icmp_seq=288 time=9092 us
72 bytes from 69.64.163.17: icmp_seq=289 time=9246 us
72 bytes from 69.64.163.17: icmp_seq=290 time=8364 us
72 bytes from 69.64.163.17: icmp_seq=291 time=8928 us
72 bytes from 69.64.163.17: icmp_seq=292 time=8285 us
72 bytes from 69.64.163.17: icmp_seq=293 time=8425 us
72 bytes from 69.64.163.17: icmp_seq=294 time=9052 us
72 bytes from 69.64.163.17: icmp_seq=295 time=8513 us
72 bytes from 69.64.163.17: icmp_seq=296 time=8464 us
72 bytes from 69.64.163.17: icmp_seq=297 time=8631 us
72 bytes from 69.64.163.17: icmp_seq=298 time=8048 us
72 bytes from 69.64.163.17: icmp_seq=299 time=8853 us

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