Working With Network Address Translation (Nat) - Polycom SoundPoint IP 600 SIP Administrator's Manual

Administrator Guide - SoundPoint
SoundPoint
arriving with the source port set to other than the negotiated remote sink port can be
rejected.
SoundPoint
less of the negotiated port. This can be useful for punching through firewalls. When
this is enabled, all RTP traffic will be sent to the specified port and will be expected to
arrive on that port as well. Incoming packets are sorted by the source IP address and
port, allowing multiple RTP streams to be multiplexed.
The RTP port range used by SoundPoint
supports conferencing and multiple RTP streams, several ports can be used concur-
rently. Consistent with RFC 1889, SoundPoint
send and receive RTCP.
Central
(boot
server)
Local

4.2.2 Working with Network Address Translation (NAT)

SoundPoint
SoundPoint
transmitted packets is the same as the associated listening port used to receive packets)
and the external IP address and ports used by the NAT on the telephone's behalf can be
configured on a per-telephone basis.
50
®
IP
® IP can also enforce symmetric port operation for RTP packets: packets
®
IP can also jam the destination transport port to a specified value regard-
Configuration file:
ipmid.cfg
Web Server
(if enabled)
Local Phone User
Interface
® IP can work with certain types of network address translation (NAT).
®
IP signaling and RTP traffic use symmetric ports (the source port in
Copyright © 2004 Polycom, Inc.
® IP can be specified. Since the telephone
®
IP uses the next higher odd port to
Specify whether to filter incoming RTP packets by IP
address, whether to require symmetric port usage, whether
to jam the destination port and specify the local RTP port
range start.
• For more information, see 4.6.1.8.3.1 RTP <RTP/> on
page 82.
Specify whether to filter incoming RTP packets by IP
address, whether to require symmetric port usage, whether
to jam the destination port and specify the local RTP port
range start.
Navigate to: http://<phoneIPAddress>/coreConf.htm#rt
Changes are saved to local flash and backed up to <Ethernet
address>-phone.cfg on the boot server. They will perma-
nently override global settings unless deleted via the Reset
User Settings menu selection.
None.
Optimizing SoundPoint