It does make a considerable difference if you are running your RTP through IP encryption (eg IPSec VPN) then the per-packet overhead becomes a significant factor. Companies such as NET (www.net.com) provide switches (VX400, VX900, etc) that run bespoke SIP-like and RTP-like protocols that merge RTP calls between 2 WAN nodes into single packets and this can reduce the per-packet overhead of encryption quite significantly. The cost is a small additional latency (eg 20-40ms) while the packets from various calls are aggregated. John PS. I have no affiliation with NET. On 28/01/12 20:26, georg@riseup.net wrote:
SIP only has gateways, no trunks. When you're dealing with VoIP, treat SIP like data, not like voice channels. Allright, but makes this a difference in practice?
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