Cisco SPA2102 Administration Manual page 72

SIP Trunking and Hunt Groups on the SPA8000
Cisco Small Business ATA Administration Guide
The following figure shows a simplified logical block diagram of the SPA8000 with
the SIP Trunking feature.
Figure 1 Logical Block Diagram of SIP Trunking
•
SIP Path: As a standalone line, the SIP User Agent (SIP UA) exchanges signaling
directly with the ITSP equipment. As a trunk line, the Line UA exchanges
signaling with the internal proxy server only. The Internal Proxy Server handles
all SIP signalling between both ends of the call, from call establishment to
termination.
•
RTP Path: Whether the line is standalone or a member of a trunk group, the Line
UA exchanges RTP packets directly with the ITSP equipment.
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