Hi, we do have a two cisco call managers 4.0, one in France and one in Angola .
The french cluster is connected to a voice gateway.
Someone configured international calls from Angola to go through the WAN (h225 Trunks with the gatekeeper controling ) from Africa to Europe and then the number dialled is translated in the CCM french cluster and putted to the voice gateway to go out.
Internal calls using short dials, between clusters working fine, but international calls show a lot of buffer underruns after a certain period. I wonder if this is the best way of doing it .
1) Shouldn't we just put the international calls from ANgola directly to the voice gateway (H323 registered) instead of goint to the CCM in france and then translate the number?
2) What happens in terms of rtp anf signalling protocols by setting up the system this way ?
1.Is it cheaper to place the calls from France? Does it save enough money to pay for the extra WAN bandwidth required? If yes to both, then it is a smart setup.
2.If the calls go through normally then you are OK. H323 handles high delay OK, though you may need fast start. I have had no issues with trunks over satellite links.
3. What exactly is the voice quality issue; choppiness, static, echo or? Do you have enough bandwidth? Is the gatekeeper limiting the number of calls to what the QOS can support? Do you have QOS configured? Does your WAN link provider have a SLA for jitter, delay, and packet loss? Do you have VAD configured? If you call cluster to cluster are you seeing any packet loss on the IP phones (hit ? twice)? Do you have the echo canceller enabled on the French gateway?
What is your end to end latency? Can you do a ping from the French gateway router to Angola?
Cisco recommends that end to end delay be under 150 ms for best quality. Satellite links (minimum 250 ms one way) always experience high delay that is perceptible to users, but I'm sure that is a fact of life in Angola. Or is there terrestrial service (microwave or fiber) out for locally placed calls? If so your users would be happier if their calls hit the PSTN in Angola.
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