Cisco SIP IP Phone 7940/7960 Version 2.2 Release Note
Available Languages
Table Of Contents
Release Notes for Cisco SIP IP Phone 7940/7960 Release 2.2
Resolved Caveats - Release 2.2
Obtaining Technical Assistance
Release Notes for Cisco SIP IP Phone 7940/7960 Release 2.2
November 6, 2001
Contents
This document lists the known problems in the Cisco SIP IP Phone 7940/7960 Version 2.2 and contains information about the Cisco SIP IP Phone 7940/7960 (hereafter referred to as the Cisco SIP IP phone) that was not included in the Cisco SIP IP phone documentation.
This document includes the following sections:
•
Obtaining Technical Assistance
New and Changed Information
For detailed information about each new feature and a list of all the Cisco SIP IP phone features, refer to the Version 2.2 of the Cisco SIP IP Phone Administrator Guide at the following URL:
http://www.cisco.com/univercd/cc/td/doc/product/voice/c_ipphon/sip7960/sipadm22/index.htm
The following new features have been added to the Cisco SIP IP phone Version 2.2:
REFER Support
The Cisco SIP IP Phone uses the SIP REFER method to initiate a transfer. The REFER method allows for the initial parties to be reconnected upon a failed attended transfer attempt. REFER is used if the target endpoint supports the method; otherwise, the phone will failover to use the BYE/Also method of transfer in earlier releases.
There are no configuration changes associated with transfer. The REFER method is used as the default. The BYE/Also method of transfer is accepted also if received by the phone instead of a REFER.
7940 Support
The Cisco SIP IP Phone software recognizes the phone model (7960 or 7940) it is booting and provides the correct 6-line (7960) or 2-line (7940) support. The Cisco SIP IP Phone 7940 data sheet is located at the following URL:
http://www.cisco.com/warp/public/cc/pd/tlhw/prodlit/7940_ds.htm
OPTIONS Support
When an OPTIONS request is received, the Cisco SIP IP Phone responds with a list of phone methods and parameters supported. The Cisco SIP IP Phone does not generate an OPTIONS request.
Configurable VoIP Control Port
The listen port for SIP messages is configurable. When the NAT enable flag is used in conjunction with the VoIP Control Port, the packets are sourced from this port rather than from an ampherol port. See the voip_control_port parameter descriptions in the section, "Modifying the Default SIP Configuration File" in Chapter 3, "Managing Cisco SIP IP Phones," at the following URL:
http://www.cisco.com/univercd/cc/td/doc/product/voice/c_ipphon/sip7960/sipadm22/index.htm
Configurable RTP Media Ports
The Cisco SIP IP Phone allows for the start and end RTP media ports to be configured. See the start_media_port and end_media_port descriptions in the section, "Modifying the Default SIP Configuration File" in Chapter 3, "Managing Cisco SIP IP Phones," at the following URL:
http://www.cisco.com/univercd/cc/td/doc/product/voice/c_ipphon/sip7960/sipadm22/index.htm
NAT Support
When network address translation (NAT) is enabled, the Cisco SIP IP Phone provides support for SIP messages to traverse NAT/Firewall networks. The Contact and Via headers are modified to reflect the NAT parameters. The Cisco SIP IP Phone can also enable NAT received processing. See the nat_enable, nat_address, and nat_received_processing parameters in the section, "Modifying the Default SIP Configuration File" in Chapter 3, "Managing Cisco SIP IP Phones," at the following URL:
http://www.cisco.com/univercd/cc/td/doc/product/voice/c_ipphon/sip7960/sipadm22/index.htm
Outbound Proxy Support
When an Outbound Proxy is configured, all SIP requests are sent to the Outbound Proxy Server instead of the configured Proxy Address. The Cisco SIP IP Phone does not have to register with the Outbound Proxy. All interactions, such as authentication, with the Outbound Proxy are treated the same as the interactions with the primary proxy. See the outbound_proxy and outbound_proxy_port descriptions in the section, "Modifying the Default SIP Configuration File" in Chapter 3, "Managing Cisco SIP IP Phones," at the following URL:
http://www.cisco.com/univercd/cc/td/doc/product/voice/c_ipphon/sip7960/sipadm22/index.htm
Caveats
This section describes caveats, or known problems, that are open in this release. It also lists closed caveats in this release.
Open Caveats - Release 2.2
•
Problem Description: When the network media is manually configured, the inline power support does not work when the Cisco SIP IP phone is connected to a Catalyst 3500 switch.
Recommended Action: When connecting to a Catalyst 3500 switch, configure the phone to automatically negotiate the network media type by selecting Auto for the Network Media Type parameter located in the Network Configuration menu.
•
Problem Description: Pressing a line button during a call displays the overview screen on which there is located a Redial and NewCall soft key. However, these soft keys are ignored by the phone if pressed.
Recommended Action: Return to the call screen (wait 8 seconds for the call screen to reappear or press the line button again).
•
Problem Description: The Cisco SIP phone does not properly handle the following call scenario:
–
–
–
Recommended Action: Press the speaker button or go off hook and back on hook several times to terminate the call.
•
Problem Description: The 7960 SIP IP Phone SDP codec negotiation can cause one-way voice when other endpoint is using asynchronous codec support.
Recommended Action: Ensure other clients support single codec. The 7960 SIP IP Phone does not support asynchronous codec.
•
Problem Description: The proxyN_port parameter in the SIP 7960 IP Phone does not default to 5060. It defaults to 0 instead.
Recommended Action: Set the proxyN_port parameter to 5060, rather than "" or "UNPROVISIONED".
•
Problem Description: On rare occasions when using speakerphone, G729a codec, VAD enabled, and DTMF, the phone encounters a DSP timeout which affects only the active call. Any subsequent calls work unless the above four factors are used again. The DSP timeout occurs only when all four of the above factors happen simultaneously, and affects only the active call.
This issue is also a side effect of excessive debug use.
Recommended Actions:
–
–
–
•
Problem Description: After a basic call is established and a mid-call INVITE is sent to the phone, with an invalid SRV entry in the Contact: header, the phone leaves the call hung. The SIP messaging is correct in that the mid-call INVITE gets rejected with a 500 Internal Server error, but the display still shows a connected call.
Recommended Action: Press the EndCall softkey or hang up the phone.
•
Problem Description: When using the BYE/Also method of transfer the BYE message does not include the Requested-By header.
Recommended Action: There is no workaround. However, the primary method for Transfer is now REFER so the BYE/Also method is used only when an endpoint cannot support REFER.
•
Problem Description: When the phone sends a REGISTER message it does not attach an action= tag to the Contact header. This can lead to mismatched registrations when another client REGISTERs with the same user ID because the 7960/7940 is always treated as action=none.
Recommended Action: Configure the other client to have action=none to avoid mismatched registrations.
•
Problem Description: When the phone receives an INVITE with multiple valid m= SDP lines (for example, m=application and m=audio), a 400 BAD Request is sent in response.
Recommended Action: None.
•
Problem Description: There is no support for a CANCEL with credentials. If a CANCEL gets challenged by the Proxy, a new CANCEL with Proxy-Authorization credentials will not be sent.
Recommended Action: None; there is no workaround.
Resolved Caveats - Release 2.2
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Related Documentation
•
•
•
•
Obtaining Documentation
The following sections explain how to obtain documentation from Cisco Systems.
World Wide Web
You can access the most current Cisco documentation on the World Wide Web at the following URL:
Translated documentation is available at the following URL:
http://www.cisco.com/public/countries_languages.shtml
Documentation CD-ROM
Cisco documentation and additional literature are available in a Cisco Documentation CD-ROM package, which is shipped with your product. The Documentation CD-ROM is updated monthly and may be more current than printed documentation. The CD-ROM package is available as a single unit or through an annual subscription.
Ordering Documentation
Cisco documentation is available in the following ways:
•
http://www.cisco.com/cgi-bin/order/order_root.pl
•
http://www.cisco.com/go/subscription
•
Documentation Feedback
If you are reading Cisco product documentation on Cisco.com, you can submit technical comments electronically. Click Leave Feedback at the bottom of the Cisco Documentation home page. After you complete the form, print it out and fax it to Cisco at 408 527-0730.
You can e-mail your comments to bug-doc@cisco.com.
To submit your comments by mail, use the response card behind the front cover of your document, or write to the following address:
Cisco Systems
Attn: Document Resource Connection
170 West Tasman Drive
San Jose, CA 95134-9883We appreciate your comments.
Obtaining Technical Assistance
Cisco provides Cisco.com as a starting point for all technical assistance. Customers and partners can obtain documentation, troubleshooting tips, and sample configurations from online tools by using the Cisco Technical Assistance Center (TAC) Web Site. Cisco.com registered users have complete access to the technical support resources on the Cisco TAC Web Site.
Cisco.com
Cisco.com is the foundation of a suite of interactive, networked services that provides immediate, open access to Cisco information, networking solutions, services, programs, and resources at any time, from anywhere in the world.
Cisco.com is a highly integrated Internet application and a powerful, easy-to-use tool that provides a broad range of features and services to help you to
•
•
•
•
•
You can self-register on Cisco.com to obtain customized information and service. To access Cisco.com, go to the following URL:
Technical Assistance Center
The Cisco TAC is available to all customers who need technical assistance with a Cisco product, technology, or solution. Two types of support are available through the Cisco TAC: the Cisco TAC Web Site and the Cisco TAC Escalation Center.
Inquiries to Cisco TAC are categorized according to the urgency of the issue:
•
•
•
•
Which Cisco TAC resource you choose is based on the priority of the problem and the conditions of service contracts, when applicable.
Cisco TAC Web Site
The Cisco TAC Web Site allows you to resolve P3 and P4 issues yourself, saving both cost and time. The site provides around-the-clock access to online tools, knowledge bases, and software. To access the Cisco TAC Web Site, go to the following URL:
All customers, partners, and resellers who have a valid Cisco services contract have complete access to the technical support resources on the Cisco TAC Web Site. The Cisco TAC Web Site requires a Cisco.com login ID and password. If you have a valid service contract but do not have a login ID or password, go to the following URL to register:
http://www.cisco.com/register/
If you cannot resolve your technical issues by using the Cisco TAC Web Site, and you are a Cisco.com registered user, you can open a case online by using the TAC Case Open tool at the following URL:
http://www.cisco.com/tac/caseopen
If you have Internet access, it is recommended that you open P3 and P4 cases through the Cisco TAC Web Site.
Cisco TAC Escalation Center
The Cisco TAC Escalation Center addresses issues that are classified as priority level 1 or priority level 2; these classifications are assigned when severe network degradation significantly impacts business operations. When you contact the TAC Escalation Center with a P1 or P2 problem, a Cisco TAC engineer will automatically open a case.
To obtain a directory of toll-free Cisco TAC telephone numbers for your country, go to the following URL:
http://www.cisco.com/warp/public/687/Directory/DirTAC.shtml
Before calling, please check with your network operations center to determine the level of Cisco support services to which your company is entitled; for example, SMARTnet, SMARTnet Onsite, or Network Supported Accounts (NSA). In addition, please have available your service agreement number and your product serial number.
This document is to be used in conjunction with the documents listed in the "Related Documentation" section.
AccessPath, AtmDirector, Browse with Me, CCIP, CCSI, CD-PAC, CiscoLink, the Cisco Powered Network logo, Cisco Systems Networking Academy, the Cisco Systems Networking Academy logo, Cisco Unity, Fast Step, Follow Me Browsing, FormShare, FrameShare, IGX, Internet Quotient, IP/VC, iQ Breakthrough, iQ Expertise, iQ FastTrack, the iQ Logo, iQ Net Readiness Scorecard, MGX, the Networkers logo, ScriptBuilder, ScriptShare, SMARTnet, TransPath, Voice LAN, Wavelength Router, and WebViewer are trademarks of Cisco Systems, Inc.; Changing the Way We Work, Live, Play, and Learn, and Discover All That's Possible are service marks of Cisco Systems, Inc.; and Aironet, ASIST, BPX, Catalyst, CCDA, CCDP, CCIE, CCNA, CCNP, Cisco, the Cisco Certified Internetwork Expert logo, Cisco IOS, the Cisco IOS logo, Cisco Press, Cisco Systems, Cisco Systems Capital, the Cisco Systems logo, Empowering the Internet Generation, Enterprise/Solver, EtherChannel, EtherSwitch, FastHub, FastSwitch, GigaStack, IOS, IP/TV, LightStream, MICA, Network Registrar, Packet, PIX, Post-Routing, Pre-Routing, RateMUX, Registrar, SlideCast, StrataView Plus, Stratm, SwitchProbe, TeleRouter, and VCO are registered trademarks of Cisco Systems, Inc. and/or its affiliates in the U.S. and certain other countries.
All other trademarks mentioned in this document or Web site are the property of their respective owners. The use of the word partner does not imply a partnership relationship between Cisco and any other company. (0110R)
Copyright © 2001, Cisco Systems, Inc.
All rights reserved.
FeedbackContact Cisco
- Open a Support Case
- (Requires a Cisco Service Contract)