We have a Cisco AS5350 which we are using for Terminating VoIP Traffic. Now the gateway is connected to 4 E1s which are R2 CAS. All the 4 E1s are working perfectly fine. We have tested making calls on all the 4 E1s individually. Now one of our customers from USA is sending us traffic to this gateway. They are using T1 on their end to send calling card traffic to us. As per their information, if they send us calls more than 24 calls, then all the calls above 24 calls are not going through. That means Calls #25, Call #26 etc..are all not going through our system. We have opened up 3 E1s for this particular customer and are unable to comprehend why the maximum calls is not going above 24 calls since all the 3 E1s allocated to this customer are working perfectly ok. On our gateway also for the first E1 the "DS0s Active High Water Mark" is showing as 24 whereas for the second and third E1s the values for the same are 3 and 1 respectively. The customer is saying that they are sending more than 24 calls at a time. We are unable to comprehend why our gateway is unable to terminate more than 24 calls. Also we have allocated 768 Kbps Bandwidth and are using codec "g729r8". With this codec and with no RTP Compression being used, the gateway should be able to accommodate easily 30 to 31 simulteneous calls.
The Outputs from the three E1 Controllers are given below for your kind perusal.
What do they hear when they dial the 25th number? Does it work if they call someone else on the 25th call? Can you receive a 25th call from somewhere else or place a 25th call while their 24 calls are active? Try turning some error debugs on right before you try the 25th call,
debug voip ccapi error
debug vtsp error
debug spe voice error
You may want to try some of the show voice spe commands as well and look for errors.
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