I am looking for Cisco products that can act as SIP gateways. These products need to be priced for the SMB market. We implement the SIP gateways by using available BRI or PRI ports on the clients existing PBX (provided it is not an IP PBX). The gateways will need to provide 16-32 concurrent outbound calls using G.729a codec. We use the PBX dialing plans to decide on how calls are routed. Local calls typically will be routed over the PSTN, but national, mobile, on net and international will be routed via VoIP. Internet connectivity is either through DSL or channelized E1. Please advise on the recommended Cisco products that will be effective for this type of operation.
The coding/decoding is done by dedicated DSP so not much of an issue. There is a full lineup of ISR voice router with 7 models up to the 3845.
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