Ace Your 350-801 CCNP Collaboration Exam

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Auto-registration is disabled on the Cisco Unified Communications Manager nodes and the phone device does not have a DN configured.

The DHCP settings are incorrectly and the phone does not have an alternate TFTP defined.

The phone cannot download and install the latest firmware.

The DN assigned to the phone is already in use by another SIP phone.

The DN configuration for this phone is shared with SCCP phone, which is not supported.

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The traversal zone on Expressway-c points to Expressway-e through the peer address field on the traversal zone, which specifies the Expressway-e server address. For dual NIC deployments, set the Expressway-e address using an FQDN that resolves the IP address of the internal interface

The external firewall must allow these inbound connections to Expressway: SIP: TCP 5061; HTTPS: TCP 8443; XMPP TCP 5222; media: UDP 36002 to 59999

Do not use a shared address for Expressway-e and Expressway-c, as the firewall

cannot distinguish between them. If static NAT for IP addressing on Expressway-e is used, ensure that any NAT operation on expressway-c does not resolve the same traffic IP address. Shared NAT IS not supported

The internal firewall must allow these inbound and outbound connections between

expressway - c and Expressway-e :sip;HTTPS(tunneled over SSH between C and E.

TCP 2222: TCP 7001: Traversal Media: UDP 2776 to 2777(or 36000 to 36011 for large VM/appliance); XMPP:TCP 7400