Zyxel-communications P-2000W V2 User Manual download pdf (Page 14)

P2000W V2 Troubleshooting Guide

The corrected working capture should include starting of the call (The SIP

invite) to call pickup (The SIP ACK). An example of successful call capture is

listed below for your reference.

Once both of the above capture is completed, send both captured file to

support to analysis the cause.

The VoIP challenge

SIP is a session initiation protocol which is an application-layer control (signaling)

protocol for creating, modifying, and terminating sessions with one or more

participants. These sessions include Internet telephone calls, multimedia distribution,

and multimedia conferences.

For SIP to successfully massively deploy there are several challenge of the real

environment it must able to work with. The most common faced problem is NAT

pass-through issue and SIP client and call server interoperability issues.

When SIP protocol is proposed it self does not consider network environment and

other technology that maybe in the deployed network. Since IPv4 IP is insufficient

and will soon run out. Thus NAT is very commonly used. Unfortunately from field

test many vendor’s NAT are not SIP friendly.

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Zyxel-communications P-2000W V2 User Manual Page 14