I hope the community can ive some good advices or/and direction of seraching the information.
We're using currenty an Opensource SIP platform (Openser/kamailio + Asterisk) for switching the VoIP calls, the PSTN gateway are doing for us external company, we just send them all external calls and get from the them the outside calls.
But we'd like to implement our own PSTN gateway, which would be compatible with our SIP platform and have good performance, we are planning to get many E1 or may be complete E3 from the Telko.
Which platform would be a good candidate to consider? would be AS5300 or AS5300XM right HW? which cards do they need to operate as gateway?
E1 is clear but do they need "High-Density Packet Voice/Fax Feature Card and DSP Module" or " 60- and 108-Universal Port Feature Cards" what is actually the difference between them?
UPD: is a SBC ( session boader control) really necessary for a simple VoIP network with PSTN gateway ? has as5300 such a feature, or it's completly different story?
AS5400XM is a TDM-IP, IP-IP gateway which supports PSTN interconnections. AS5400XM Platform is the best Gateway for PSTN interconnections, which supports 16 E1/T1 terminations using E1/T1 Cards & High density DSP PVDM Modules.
Attached link will give you more clarity on the DSP module requirements.
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