Table Of Contents
Release Notes for Cisco Voice Switch Service Module (VXSM) Release 5.0.70
These release notes are part number OL-7088-01 Rev. B0, July 27, 2005.
The Voice Switch Service Module (VXSM) product is supported by the MGX 8880 Media Gateway and the MGX 8850 Multiservice Switch. Refer to these release notes for platform and version level support guidelines.
The VXSM software release notes are supported by the Cisco Voice Switch Services (VXSM) Configuration Guide and Command Reference, Release 5, which is available on cisco.com.
Table of Contents
About Release 5.0.70
The VXSM Release 5.0.70 follows VXSM Release 5.0.20.
New Features in Release 5.0.70
The following new features are introduced in the 5.0.70 release of VXSM.
Support for Media Gateway Control Protocol
VXSM Release 5.0.70 now supports the Media Gateway Control Protocol (MGCP 1.0) in addition to the two protocols (TGCP and H.248) that are supported in the previous release. At any time only one gateway control protocol is supported on a VXSM card. The protocol is user selectable when the VXSM image is loaded from the PXM disk. This is accomplished through the PXM setrev command using the -ccp <CallControlProtocol> parameter.
Support for MGCP 1.0 permits interoperability between VXSM and Cisco PGW media gateway controllers.
NFAS with D-channel Backup
In VXSM Release 5.0.70, when performing ISDN PRI backhaul, the D-Channel in n Non-Facility Associated Signaling (NFAS) voice stream can be protected with the use of a backup D-channel.
NFAS voice streams employ 479 B channels plus 1 D-channel that controls up to a maximum of 20 DS1s interfaces. If the D channel fails it can bring down all the 479 bearer B channels.
Multiprotocol Service Module Interoperability
For AAL2 trunking applications, VXSM can now operate in conjunction with a Multiprotocol Service Module (MPSM) in which the MPSM provides the interface to the ATM network. Interworking with the MPSM enables the MGX Voice Gateway to support IMA, ATM and Frame Relay services with channelized capability on DS1 and DS0 levels.
The MPSM card must be configured for ATM context using the MPSM cnfclictx atm command. After the context is set to ATM, provisioning is performed with the upln, addport and addcon command sequence. For more details, please refer to the MPSM user documentation.
New Features in Release 5.0.20
The following new features were introduced in the 5.0.20 release of VXSM.
Additional Media Gateway Control Protocol
The Trunking Media Gateway Control Protocol (TGCP) is now supported for communication between the VXSM card and the Media Gateway Controller in switching applications. This is in addition to the H.248 protocol supported in earlier releases. VXSM does not support both protocols simultaneously. The user must select which one of the two protocols is to be used when the VXSM image is loaded initially from the PXM.
In application where ISDN D channel signaling lines are connected to VXSM, the VXSM card can be configured to extract the layer 3 (Q.931) packets and backhaul them to the media gateway controller
For communication between VXSM and the media gateway controller the protocol stack is based upon the Cisco proprietary Session Manger and RUDP (Reliable UDP).
Communication between the VXSM and the gateway controller is session based. One session set must be established. The session set contain one or two session groups (one for non-fault tolerant or two for fault tolerant configurations). Each session group can support up to four RUDP sessions.
Differentiated Services (DiffServ)
VXSM provides support for the quality of service (QOS) feature known as DiffServ. The DiffServ feature permits devices at the edge of the network to specify the contents of the Type of Service (TOS) field in the IPv4 header as a differentiated services point code. This point code can then be used by routers in the network to determine per hop behavior (PHB).
Computer Assisted Law Enforcement Act (CALEA)
VXSM provides support for CALEA intercepted calls. The CALEA feature functions only in switching applications using the TGCP gateway control protocol.
During call setup, the media gateway controller uses the TGCP commands of CRCX and MDCX with CALEA parameters to signify that a call is to be subject to CALEA surveillance. During a CALEA call, the VXSM sends a duplicate of the call contents to a TGCP defined CALEA server.
VXSM supports up to 60 concurrent CALEA calls. Statistics collection for CALEA streams is not supported.
CALEA support is an orderable item. Customers who require this feature must specify the VXSM CALEA firmware image at the time of order.
Voiceband Data Profiles and Event Mapping
Within a voice circuit call, VXSM now supports the handling of voiceband data such as clear channel, fax, and modem transmissions. VXSM can detect tones associated with voiceband data on both the voice and IP sides of the networks, and act accordingly. Upon detection of a voiceband tone, VXSM will perform the necessary upspeed procedure that may involve the following processing:
•Disabling echo cancellation
•Modify packetization period, gain, DC offset, and jitter parameters.
VXSM informs the other (remote) end of the connection when an upspeed procedure is to be performed. There are two different methods by which upspeed at the remote end is triggered.
The first method is Fax/Modem passthrough with a Cisco proprietary protocol in which a Named Signaling Event (NSE) is sent to the remote end.
The second method is Fax/Modem passthrough with IP side tone detection and relies on both ends of the connection being able to detect tones on both the TDM and IP sides. This method is only supported with TGCP or MGCP call setup.
Fax/Modem passthrough features are as follows:
•FAX/Modem Provisioning redundancy.
•Upspeed codec from G711 to G711.
•Upspeed codec from G711 to G726.
•Upspeed codec from G729 to G711 with VXSM to VXSM with low priority.
•Upspeed codec from CCD to G711 with VXSM to VXSM with low priority.
•Upspeed codec from CCD to G726 with VXSM to VXSM with low priority.
•Graceful upgrade for fax/modem provisioning.
•Detection of the following tones, CNG(1100hz), CED/ANS(2100hz), /ANS(2100hz with phase reversal, and V.21 Fax Preamble.
The voiceband event mapping feature permits VXSM to determine how VBD events are to be handled. When this feature is configured, VBD events are mapped to different event handling functions categorized by the attributes defined in different kinds of profiles, such as fax relay profile, or VBD profile.
For each VXSM card type (OC-3 or T1/E1), two firmware images are available, namely, Non-CALEA and CALEA. At order time, the user must specify whether a Non-CALEA or CALEA image is required.
The Non-CALEA image is available in three versions. One version supports the H.248 media gateway controller protocol, one supports the MGCP media gateway controller protocol, and the third supports the TGCP media gateway controller protocol. The user must choose between the H.248, MGCP, and TGCP versions when the image is first loaded from the PXM using the setrev command.
The CALEA image supports TGCP only. However, this protocol must be explicitly selected when the image is loaded from the PXM using the setrev command.
Upgrading from an Earlier VXSM Release
VXSM can be gracefully upgraded (configuration is preserved) from VXSM Release 5.0.20 so long as the original and the upgraded images are of the same version. Because MGCP is being introduced in this release and does not exist in earlier releases, the only supported upgrades to 5.0.70 are as follows:
•Non-CALEA, TGCP version to Non-CALEA, TGCP version
•Non-CALEA, H.248 version to Non-CALEA, H.248 version.
•CALEA, TGCP version to CALEA, TGCP version.
When loading or upgrading a boot or runtime image to a VXSM card, users must observe the following caution.
Caution Many of the commands involved in loading or upgrading boot and runtime images can take several minutes to execute completely. If the user resets or otherwise disturbs the VXSM card during a loading or upgrading process, the card can easily be damaged to the extent that it must be returned to the factory for repair.
THE REAPPEARANCE OF THE COMMAND PROMPT AFTER A COMMAND IS ENTERED DOES NOT INDICATE THAT THE IMAGE LOAD OR UPGRADE HAS BEEN COMPLETED.
After the execution of the burnboot, clrsmcnf, loadrev, or setrev commands, the user must execute either a dspcds or dsprev command periodically to verify that the state of the VXSM card being loaded or upgraded is either Active, Standby, or Failed.
ONLY WHEN THE CARD IS DISPLAYED TO BE IN ONE OF THESE STATES IS IT SAFE TO GO TO THE NEXT STEP.
Online Diagnostic feature as applied to VXSM.
The online diagnostics feature as implemented on the PXM45 card is supported on VXSM Release 5.0. When enabled, using the PXM45 cnfdiag command, this feature performs non-intrusive diagnostic tests that use four of the VXSM's DSP codecs.
If the user executes the VXSM dspdspcodecpools command, the resulting display shows the four codecs being used (for diagnostics) and subtracts them from the remaining available codecs (see example below).MGX8850.9.VXSM.a > dspdspcodecpools=============================================================DSP codec capacity usage=============================================================Codec pool Current utilized Current availablecapacity (#calls) capacity (#calls)========== ================= =================G711 family 4 8060G729/G726/T.38 family 0 4030
The online diagnostics feature does not reduce the maximum number of 8064 codecs available for calls on the VXSM card. If the number of call requests on the VXSM is sufficiently high, the online diagnostic feature is disabled automatically and the four codecs are made available for active calls.
DSP Resources under Mixed Codec Conditions
When the same codec is used to setup calls on the gateway the available DSP resources will be fully utilized. However when different codecs are used to setup calls the amount of utilizable DSP resources may be limited in certain cases due to fragmentation.
Fragmentation is said to have occurred when the available capacities on two different DSP resources have enough available capacity to support a call of a particular codec type but cannot support that codec type individually.
Consider two DSP resources whose available capacity is 1 unit each making the total available capacity 2 units. However a codec that requires 2 units cannot be supported in the system because the available capacities have been fragmented across the individual DSP resources.
The DSP allocation algorithm on VXSM does make an attempt to smooth the effects of fragmentation but towards the end, fragmentation could happen as the future pattern of calls cannot be predicted beforehand.
Configuring Switching and Trunking Applications
The simultaneous operation of mixed applications (Switched VoIP applications and Non-switched Trunking applications) is not supported on a VXSM card. However, both applications can be supported in the Media Gateway by using multiple VXSM cards.
VXSM Management Information Base
The VXSM Management Information Base (MIB) Version 5.0.70 is available by request through your Cisco VXSM product marketing representative.
Note VXSM Release 5.0.70 is only supported with PXM-45.
VXSM software interoperability with the Cisco MGX 8850 (PXM45) Multiservice Switch or the MGX 8880 Media Gateway platform software is listed in Table 1.
Table 2 describes the software images available for Release 5.0.70 for VXSM.
Caveats for VXSM Release 5.0.70
This section describes software caveats for Release 5.0.70.
Open Caveats in Release 5.0.70
Table 3 describes the open caveats in VXSM Release 5.0.70.
Resolved Caveats in Release 5.0.70
Table 4 describes the open caveats that existed in VXSM Release 5.0.20 and are now resolved in Release 5.0.70.
The MGX-VXSM-155 card is also known as the MGX-VXSM-4OC card.
The MGX-VXSM-T1/E1 card is also known as the MGX-VXSM-48T1/E1 card.
The following documents contains information that may be useful to software Release 5.0 for VXSM:
•Cisco MGX 8850 (PXM1E/PXM45), Cisco MGX 8950, and Cisco MGX 8830 Configuration Guide, Release 5
•Cisco MGX 8850 (PXM1E/PXM45), Cisco MGX 8950, and Cisco MGX 8830 Hardware Installation Guide, Releases 2 Through 5
•Cisco ATM Services (AXSM) Configuration Guide and Command Reference for MGX Switches, Release 5
•Cisco MGX Route Processor Module (RPM-XF) Installation and Configuration Guide, Release 4
•Cisco MGX 8880 Media Gateway: A Guide to User Documentation.
•Release Notes for Cisco MGX 8850 (PXM1E/PXM45), Cisco MGX 8950, and Cisco MGX 8830 Switches, Release 5.0.00
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