Cisco Cisco Expressway Maintenance Manual
Group Chat
If you configure the Group Chat feature on a Unified CM IM&P server in an XMPP federation deployment,
you must publish DNS SRV records for the federated chat node aliases.
you must publish DNS SRV records for the federated chat node aliases.
To allow IM and Presence Service to discover a particular XMPP federated chat node alias, the federated
enterprise must publish an _xmpp-server DNS SRV record in its public DNS server. Similarly, IM and
Presence Service must publish the same DNS SRV record in DNS for its domain. For example:
enterprise must publish an _xmpp-server DNS SRV record in its public DNS server. Similarly, IM and
Presence Service must publish the same DNS SRV record in DNS for its domain. For example:
Domain
Service
Protocol
Priority
Weight
Port
Target host
chatroom1.example.com
xmpp-server
tcp
0
0
5269
vcse.example.com
Both enterprises must publish the service on port 5269. The published FQDN must also be resolvable to an
IP address in DNS.
IP address in DNS.
Alternatively, to use group chat aliases on federated servers, you can configure static routes on the
Expressway-E (
Expressway-E (
Configuration > Unified Communications > Federated static routes
) for each chat node
alias.
Note that:
n
The chat node aliases are configured on Unified CM IM&P Administration (
Messaging > Group Chat
Server Alias Mapping
).
n
Internal users do not need to use DNS to discover chat nodes; they get the chat room details from their
local IM&P servers.
local IM&P servers.
for more information about point-to-point instant messaging and
group chat.
Port usage for XMPP federation
This section summarizes the firewall ports that need to be opened for XMPP federation.
Outbound from Expressway-C (private) to Expressway-E (DMZ)
Purpose
Protocol
Expressway-C (source)
Expressway-E (listening)
XMPP
TCP
Ephemeral port
7400
Outbound from Expressway-E (DMZ) to public internet
Purpose
Protocol
Expressway-E (source)
Federated XMPP server
(listening)
(listening)
XMPP
TCP
Ephemeral port
5269
Inbound from public internet to Expressway-E (DMZ)
Purpose
Protocol
Federated XMPP server
(source)
(source)
Expressway-E (listening)
XMPP
TCP
Ephemeral port
5269
Cisco Expressway Administrator Guide (X8.2)
Page 72 of 378
Unified Communications
External XMPP federation