I am currently trying to link a PBX using a Sangoma A101D E1 card to an Alcatel 4400 PBX.
At the moment both PBX's are in different physical locations so I have 2 Cisco 2610XM routers at each end allowing the link to be passed up a fibre.
Each router has an NM-HDV along with a WIC-1MFT-E1. The NM-HDV has 3 PVDM-12 SIMM's in each router. I am running IOS 12.4(17) IP VOICE
The system works fine at the moment, can hold calls, ring both directions etc without problem but my issue is that there is a slight voice quality issue (degraded and hissy) and roughly a half second delay in speech. This is quite noticable when in a call.
I am therefore not sure whether its a configuration issue or a hardware processing problem.
A point to note is that I have taken the PBX with the Sangoma card and plugged it directly into the Alcatel PBX and the voice quality is crystal clear with no delay. I have also changed fibre's, converters etc but there is still a delay when passing the E1 through the routers.
The delay is definatly being added during the routing phase.
Can someone advise please? - I'm honestly thinking its due to the age of the hardware, if so, can someone recommend replacement hardware?
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