Cisco Cisco Expressway Maintenance Manual
Purpose
Protocol
Microsoft client /
Edge server
Edge server
Expressway-E
ICE messaging (STUN/TURN)
(Expressway-E must listen on TCP 3478
for screen sharing relay requests from
Microsoft clients, and on UDP 3478 for
A/V media relay requests)
for screen sharing relay requests from
Microsoft clients, and on UDP 3478 for
A/V media relay requests)
UDP & TCP
3478
3478
UDP media
UDP
1024-65535
24000-29999
Table 24 External Microsoft Client / Edge Server and Expressway-E
Purpose
Protocol
B2BUA IP port
Transcoder
B2BUA communications with transcoder
(Cisco AM GW)
(Cisco AM GW)
TLS
65080
5061
Table 25 Between B2BUA and External Transcoder
Device Authentication Port Reference
H.350 Directory Service
The following table lists the ports used for device authentication between Expressway and the H.350 server. They are
configurable via Configuration > Authentication > Devices > H.350 directory service.
configurable via Configuration > Authentication > Devices > H.350 directory service.
Purpose
Expressway port
Destination port
H.350 LDAP server
TCP ephemeral port
TCP/389 or TCP/636
Active Directory (Direct)
The following table lists the ports used for device authentication between Expressway and the AD system. They are
configurable via Configuration > Authentication > Devices > Active Directory Service.
configurable via Configuration > Authentication > Devices > Active Directory Service.
Purpose
Expressway port
Destination port
Kerberos Key Distribution Center
UDP ephemeral port
88 UDP
Kerberos
TCP ephemeral port
88 TCP
Expressway with Domain Controller (CLDAP)
UDP ephemeral port
389 UDP
Expressway with Domain Controller (LDAP)
TCP ephemeral port
389 / 636 TCP
Client credential authentication with the Domain
Controller (Microsoft-DS). Expressway initially tries port
445, but if that cannot be reached it tries port 139.
Controller (Microsoft-DS). Expressway initially tries port
445, but if that cannot be reached it tries port 139.
TCP ephemeral port
445 / 139 TCP
344
Cisco Expressway Administrator Guide
Reference Material