losing sip trunks

[430s]

hello,
I have a customer with a splicecom voip system.
It's connected to sip trunks.
What happens is: you get about 30secs of service [ie the phones work] then it loses service [ie the phones don't work].
The service provider says the sip trunks are fine, the network administrator says the network is perfect and the voip switch is not on his lan anyway.
This is a new install and, initially, all worked but after a few days this problem arose.
Someone is going there today to look at it: any ideas?

 

[430s]

more info:
This is an 8meg standard adsl
There are 8 sip trunks provided
The adsl provider has reported as fluctuating between <1meg to as high as 11meg

 

[430s]

solved:
1. splicecom incorrectly programmed
2. connected to standard adsl!
3. fault on adsl

 

[Crowtalks]

What was the fault with the ADSL?

NCSS NCTS NCTE

 

[430s]

the adsl was losing packets [ie a network / off-site router fault]