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Cisco Expressway IP Port Usage Configuration Guide
Table 9 SIP Calls Port Reference (continued)
Purpose
Src. IP
Assent RTCP
SIP endpoint
(or its
(traversed
firewall)
media)
Assent RTP
Expressway-
E
(traversed
media)
TURN control Any
IP address
TURN media
Expressway-
E
TURN media
Any
IP address
† The request could be from any IP address, unknown to the TURN server. Assume for example, that endpoint A and
endpoint C (TURN clients) in the diagram can use the Expressway-E TURN server. The actual IP address from which
the TURN server receives the request could be the endpoint's firewall egress address (NATed).
‡ The media could go to any of the candidate addresses. For example, before ICE negotiation the TURN server does
not know which of endpoint B's candidate addresses will be the highest priority.
Note: The endpoints A, B, and C in the diagram only show media connections to avoid unnecessary lines. They would
use the same signaling connections as shown for the other endpoints / bridges.
Src. ports
>=1024
Could be translated by
the firewall to port where
the media egressed,
rather than an endpoint
port
36000-59999
>=1024 (signaling port
†
from endpoint or the
firewall)
24000-29999
>=1024
‡
Port of relevant
ICE candidate: host
IP port, server reflexive
port (outside firewall
port), or TURN server
port
Protocol Dest. IP
UDP
Expressway-
E
UDP
SIP endpoint
(or its
firewall)
UDP
Expressway-
& TCP
E
Any
UDP
IP address
& TCP
UDP
Expressway-
& TCP
E
17
Dst. Ports
36000-59999
>=1024
Expressway waits until it
receives media, then sends
media to that source port
(which could be the port where
the media egressed the firewall,
not an endpoint port)
3478 (Small/Medium)
3478-3483 (Large)
>=1024
24000-29999
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