Been fighting with latency issues using nortel voip trunking and BCMS. I spoke to a high level Cisco gov major accounts rep who says they have been using voip phones over satellite in Iraq with good luck. Any body out there use call maanger over high latency satellite links ?
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Cisco VOIP and satellite latency
- Thread starter mando1
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SuperRaton
IS-IT--Management
Hello,
i am interested also, we have implemented Cisco IP telephony over satellite, but with small problems we dont know how to fix. We dont know if the problem its in our side or in the satellite part, managed by Schlumberger, the bandwith its 2MBs.
The problem is that after a variable number of minutes calling to a phone outside of the network(mobile or analog), there are problems of jitter in the IP phones, the external phones does not have problems. The calls in the network works good, and we are using an antenna and its IDU on each location.
I am looking how to fix it without luck for the moment.
i am interested also, we have implemented Cisco IP telephony over satellite, but with small problems we dont know how to fix. We dont know if the problem its in our side or in the satellite part, managed by Schlumberger, the bandwith its 2MBs.
The problem is that after a variable number of minutes calling to a phone outside of the network(mobile or analog), there are problems of jitter in the IP phones, the external phones does not have problems. The calls in the network works good, and we are using an antenna and its IDU on each location.
I am looking how to fix it without luck for the moment.
SuperRaton
IS-IT--Management
We have a latency about 550ms.
About QoS, we only do classification and marking, giving the higher priority to the voice. The IDU from Schlumberger must look our marks and send the traffic with that priority.
for the infrastructor we are using 2821 routers to connect to the WAN and 6500 switches for the LAN.
About QoS, we only do classification and marking, giving the higher priority to the voice. The IDU from Schlumberger must look our marks and send the traffic with that priority.
for the infrastructor we are using 2821 routers to connect to the WAN and 6500 switches for the LAN.
150ms is the maximum latency before you experience voice degradation.
Your connection at 550ms is way beyond that and qos will be able to make it a bit more bearable but will never fix it.
No magic fix here besides getting a reliable link with less than 150ms latency sustained at all times.
Your connection at 550ms is way beyond that and qos will be able to make it a bit more bearable but will never fix it.
No magic fix here besides getting a reliable link with less than 150ms latency sustained at all times.
SuperRaton
IS-IT--Management
with Satellite links, i think 500ms is normal.. am i wrong???
SuperRaton
IS-IT--Management
Its ok whykap, i know 150 is the limit for voice, but the only solution for our network is using the satellite WAN.
Iwontremember
IS-IT--Management
150 is Cisco's limit and not real life.
i have had 250-275 ms and voice quality was fine.
i have had 250-275 ms and voice quality was fine.
Iwontremember
IS-IT--Management
It was running over a VPN using a Verizon card in a laptop.
The 250-275 ms I was getting was not affecting quality at all.
And no we would not deply IPT in a production enviroment...but it does work
The 250-275 ms I was getting was not affecting quality at all.
And no we would not deply IPT in a production enviroment...but it does work
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