Cisco IE-3000-8TC Administration Guide

Significant Behavior of SIP Trunk
SIP trunk exhibits significant behavior while processing PSTN calls in Cisco Business Edition 3000.
The SIP trunk supports the following features:
• Basic Outgoing/Incoming Call
• Early and Delayed Offer
• PRACK
• Session Timers
• PAI and RPID for Identity
• DTMF using RFC 2833, KPML, and Unsolicited Notify
• Hold/Resume, Transfer, Conference, Forwarding
• Diversion Header
• MWI
• Options Ping
The following sections details the behavior of SIP trunk specific to Cisco Business Edition 3000.
• Incoming 302 Moved Temporarily, on page 48
• Incoming OOD REFER Message Handling, on page 49
• Calling Party Transformation, on page 49
• Connected Party Transformation, on page 50
Incoming 302 Moved Temporarily
The SIP service provider sends 302 message to the Cisco Business Edition 3000 to reach to SIP Uniform
Resource Identifier (URI) as specified in the Contact header field. By default, the SIP trunk will use the
Redirect by Application feature to reroute the PSTN calls. The SIP trunk checks the class of service and the
privilege of the calling user before redirecting the calls.
In a SIP environment, the two possible ways of forwarding or redirecting a call are sending SIP 302 Moved
Temporarily with one or more Contact: headers as response to an INVITE or are sending a new INVITE to
the new destination.
Cisco Business Edition 3000 sends an INVITE to the new destination upon reception of 302 Moved temporarily
but it cannot generate such a response. The 302 Moved temporarily response is received when call forward
is enabled on a SIP endpoint.
The service provider can be configured to react in different ways when a SIP call is forwarded or redirected
by one of the call legs. Most often, a SIP peer sends a SIP response 302 Moved temporarily with the new
destination URI appearing in the Contact: header of the message.
Similar to Call Transfer Supplementary service, the service provider can be configured to pass along the 302
Moved Temporarily to the originating call leg or to react to it and send a new INVITE on behalf of the
forwarded (FWED) party.
Administration Guide for Cisco Business Edition 3000, Release 8.6(4)
48 OL-27022-01
Common Configuration Concepts in Cisco Business Edition 3000

Cisco IE-3000-8TC Specifications

General

Switching Capacity	16 Gbps
MAC Address Table Size	8000
Uplink Ports	2 x 10/100/1000Base-T or SFP (Small Form-Factor Pluggable)
Operating Temperature	-40°C to 70°C
Mounting	DIN rail
Ports	8 x Ethernet 10/100Base-TX ports
Jumbo Frame Support	Yes