Cisco Cisco Expressway
n
Deskphone control (QBE/CTI)
n
Additional mobility features including DVO-R, GSM handoff and session persistency
n
Self-care portal
n
Support for Jabber SDK
n
Shared lines are supported in a limited way. Multiple endpoints can share a line but in-call features (like
hold/resume) only work on the first endpoint that answers. Endpoints sharing the line may not correctly
recognise the state of the call.
hold/resume) only work on the first endpoint that answers. Endpoints sharing the line may not correctly
recognise the state of the call.
Unsupported features and limitations when using mobile and remote
access
access
n
Secure XMPP traffic between Expressway-C and IM&P servers (XMPP traffic is secure between
Expressway-C and Expressway-E, and between Expressway-E and remote endpoint)
Expressway-C and Expressway-E, and between Expressway-E and remote endpoint)
n
Calls involving secure endpoints remotely registered to Unified CM via Expressway may end up with a
portion of the call using non-secure media; these portions will only ever be on sections of the call that are on
premises (between the Expressway-C and endpoints registered locally to Unified CM), never on the public
Internet
portion of the call using non-secure media; these portions will only ever be on sections of the call that are on
premises (between the Expressway-C and endpoints registered locally to Unified CM), never on the public
Internet
n
Endpoint management capability (SNMP, SSH/HTTP access)
n
Multi-domain and multi-customer support; each Expressway deployment supports only one IM&P domain
(even though IM & Presence 10.0 or later supports multiple IM&P domains)
(even though IM & Presence 10.0 or later supports multiple IM&P domains)
n
The Expressway-C used for Mobile and Remote Access cannot also be used as a Lync 2013 gateway (if
required, this must be configured on a stand-alone Expressway-C
required, this must be configured on a stand-alone Expressway-C
n
NTLM authentication via the HTTP proxy
n
XMPP federation managed directly by Expressway-E (note that remote client access via Expressway for
XMPP inter domain federation managed by CUP is supported)
XMPP inter domain federation managed by CUP is supported)
n
Maintenance mode; if an Expressway-C or Expressway-E is placed into maintenance mode, any existing
calls passing through that Expressway will be dropped
calls passing through that Expressway will be dropped
n
The Expressway-E must not have TURN services enabled
n
The Expressway-E DNS hostname must not contain underscore characters (it can only contain letters,
digits and hyphens)
digits and hyphens)
n
Deployments on Large VM servers are limited to 2500 proxied registrations to Unified CM (the same limit
as Small / Medium VM servers)
as Small / Medium VM servers)
Protocol summary
The table below lists the protocols and associated services used in the Unified Communications solution.
Protocol
Security
Service
SIP
TLS
Session establishment – Register, Invite etc.
HTTPS
TLS
Logon, provisioning/configuration, directory, visual voicemail
RTP
SRTP
Media - audio, video, content sharing
XMPP
TLS
Instant Messaging, Presence
Unified Communications: Mobile and Remote Access via Cisco Expressway Deployment Guide (X8.1.1)
Page 28 of 36
Additional information