#400-051

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Cisco CCIE Collaboration 400-051 Exam Dumps

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(via https://www.youtube.com/watch?v=s2tYCjszI0M)

[sjostke]

MGCP Flows

It’s something I didn’t do in many many years, that’s why I create this post. Just for me to find all the information for the next time when I will have to configure MGCP.

  MGCP Verbs :

Command Message Name Sent By Description AUEP AuditEndpoint CallManager Get the status of a given endpoint. AUCX AuditConnection CallManager Retrieves all the parameters associated with a connection. CRCX CreateConnection CallManager Creates a connection between two endpoints. DLCX DeleteConnection Both From CallManager:Terminates a current connection. From Gateway:Indicates that a connection can no longer be sustained. MDCX ModifyConnection CallManager Changes the parameters (Update info) associated with an established connection. RQNT NotificationRequest CallManager Instructs the gateway to watch for special events such as hooks or DTMF tones. It is also used to instruct the gateway to provide a signal to the endpoint (for example, dial tone and busy tone). NTFY Notify Gateway Informs the Cisco CallManager when requested events occur. RSIP RestartInProgress Gateway Informs the Cisco CallManager that an endpoint or group of endpoints are taken out or placed back into service. EPCF Endpoint configuration Callmanager Alert configuration of the endpoint(things like gain level, codec, etc

Key Parameters :

X: Request id, RQNT/NTFY correlator

C: Callid, String

N: Notified entity (addr of call agent to be notified)

I: Connection id

S: Signal request(dialtone, ringback etc)

M : Connection mode (sendonly, recvonly, sendrecv)

T: Events to be detected (on/off hook, DTMF)

O: Events detected

R: Events requested

D: Digit map

B: Bearer Information (A-law, mu-law)

  Here is a call between a SIP device and the FXS phone. The picture above is pretty correct. 😉

VG200 FXS (7777) calls SIP (1002)

Red is VG200, Blue is CUCM

  NTFY 100785530 aaln/S0/[email protected] MGCP 0.1 N: [email protected]:2427 X: 52 O: L/hd

200 100785530 RQNT 100 AALN/S0/[email protected] MGCP 0.1 X: 53 R: L/hu, D/[0-9ABCD*#] S: L/dl Q: process,loop 200 100 OK NTFY 100785531 aaln/S0/[email protected] MGCP 0.1 N: [email protected]:2427 X: 53 O: D/1 200 100785531 RQNT 101 AALN/S0/[email protected] MGCP 0.1 X: 54 R: L/hu, D/[0-9ABCD*#], L/hf S: Q: process,loop

200 101 OK NTFY 100785532 aaln/S0/[email protected] MGCP 0.1 N: [email protected]:2427 X: 54 O: D/0 200 100785532

NTFY 100785533 aaln/S0/[email protected] MGCP 0.1 N: [email protected]:2427 X: 54 O: D/0

200 100785533

NTFY 100785534 aaln/S0/[email protected] MGCP 0.1 N: [email protected]:2427 X: 54 O: D/2

200 100785534

CRCX 102 AALN/S0/[email protected] MGCP 0.1 C: A000000001a005ac000000F5 X: 55 L: p:20, a:PCMU, s:off, t:b8, fxr/fx:t38 M: recvonly R: L/hu Q: process,loop

200 102 OK I: F v=0 c=IN IP4 192.168.5.6 m=audio 19314 RTP/AVP 0 100 a=rtpmap:100 X-NSE/8000 a=fmtp:100 192-194,200-202 a=X-sqn:0 a=X-cap: 1 audio RTP/AVP 100 a=X-cpar: a=rtpmap:100 X-NSE/8000 a=X-cpar: a=fmtp:100 192-194,200-202 a=X-cap: 2 image udptl t38

RQNT 103 AALN/S0/[email protected] MGCP 0.1 X: 56 R: L/hu S: G/rt Q: process,loop

200 103 OK

MDCX 104 AALN/S0/[email protected] MGCP 0.1 C: A000000001a005ac000000F5 I: F X: 57 L: p:20, a:PCMU, s:off, t:b8, fxr/fx:t38 M: sendrecv R: L/hu, L/hf, D/[0-9ABCD*#], FXR/t38 S: Q: process,loop v=0 o=- 15 0 IN EPN AALN/S0/[email protected] s=Cisco SDP 0 t=0 0 m=audio 29092 RTP/AVP 0 c=IN IP4 192.168.5.117 a=X-sqn:0 a=X-cap:1 image udptl t38

200 104 OK

RQNT 105 AALN/S0/[email protected] MGCP 0.1 X: 58 R: L/hu, D/[0-9ABCD*#], L/hf, FXR/t38 S: Q: process,loop

200 105 OK

MDCX 106 AALN/S0/[email protected] MGCP 0.1 C: A000000001a005ac000000F5 I: F X: 59 M: recvonly R: L/hu Q: process,loop

200 106 OK

DLCX 107 AALN/S0/[email protected] MGCP 0.1 C: A000000001a005ac000000F5 I: F X: 5a R: L/hu S: Q: process,loop

250 107 OK P: PS=381, OS=60960, PR=377, OR=60320, PL=0, JI=7, LA=1 NTFY 100785535 aaln/S0/[email protected] MGCP 0.1 N: [email protected]:2427 X: 5a O: L/hu

200 100785535 RQNT 108 AALN/S0/[email protected] MGCP 0.1 X: 5b R: L/hd S: Q: process,loop 200 108 OK

More information : http://www.cisco.com/c/en/us/support/docs/voice/media-gateway-control-protocol-mgcp/44130-understanding-mgcp.html

For debugging and decoding the messages : http://www.cisco.com/c/en/us/support/docs/voice-unified-communications/unified-communications-manager-callmanager/42104-debug-mgcp.html

http://docwiki.cisco.com/wiki/Cisco_IOS_Voice_Troubleshooting_and_Monitoring_–_MGCP_Overview#Figure:_MGCP_Call_Flow_Topology

MGCP Flows was originally published on blog.joostvandermade.com

[sjostke]

Personal Notes on Qos on Cisco 2960

I wanted to see what happens when you configure egress Qos with SRR. To accomplish this, I create a policy-map which set the DSCP 40 for WWW traffic.

ip access-list extended ACL_HTTP permit tcp any any eq www

class-map match-all CM_HTTP match access-group name ACL_HTTP ! ! policy-map PM_QOS class CM_HTTP set dscp cs5

interface FastEthernet0/1 description laptop mls qos trust device cisco-phone service-policy input PM_QOS

I got a PC and Laptop connected via a Cisco 2960. On the PC I run iperf.exe on the default port and on port 80. On the laptop I have also 2 client iperf running.

Normal traffic is marked as cos-0 and www traffic with DSCP 40. Cos 0 is going to the queue 2 of the egress and DSCP is going to queue 1.

On the PC interface I configured :

interface FastEthernet0/3 description PC srr-queue bandwidth share 10 20 30 40 srr-queue bandwidth shape 10 0 0 0 mls qos trust device cisco-phone

The www traffic is now only 10 Mb/s because shape is limiting also the traffic.

srr-queue bandwidth shape 10 0 0 0 means that Queue 1 is 1/10 of the bandwidth. This is guaranteed and limit.

ssr-queue bandwidth share  10 20 30 40 means that Queue 2 is 20/100 Queue3 is 30/100 and Queue4 is 40/100 of the remaining bandwidth.

Normally all PC traffic is set to COS0 and this will be going into queue 2.

SW2960#sh mls qos maps dscp-out Dscp-outputq-threshold map: d1 :d2 0 1 2 3 4 5 6 7 8 9 ------------------------------------------------------------ 0 : 02-01 02-01 02-01 02-01 02-01 02-01 02-01 02-01 02-01 02-01 1 : 02-01 02-01 02-01 02-01 02-01 02-01 03-01 03-01 03-01 03-01 2 : 03-01 03-01 03-01 03-01 03-01 03-01 03-01 03-01 03-01 03-01 3 : 03-01 03-01 04-01 04-01 04-01 04-01 04-01 04-01 04-01 04-01 4 : 01-01 01-01 01-01 01-01 01-01 01-01 01-01 01-01 04-01 04-01 5 : 04-01 04-01 04-01 04-01 04-01 04-01 04-01 04-01 04-01 04-01 6 : 04-01 04-01 04-01 04-01

SW2960#sh mls qos maps cos-out Cos-outputq-threshold map: cos: 0 1 2 3 4 5 6 7 ------------------------------------ queue-threshold: 2-1 2-1 3-1 3-1 4-1 1-1 4-1 4-1

My lab :

Testing the link without any www traffic.

  Here is the WWW trafic limited to 10 Mb (1/10 of the 100Mb link)

The other traffic got the remaining bandwidth

The default cos-output-q mapping

Default traffic in Queue1 (Cos0)

I did also some more testing with different queue’s and iperf instances and the bottem line is :

SHAPE = 1/xx of the bandwidth Guaranteed and Limits

SHARE = x / w+x+y+z weight Balance the remaining bandwidth over the queue.

  Background information about Qos can be found at :

http://www.cisco.com/c/en/us/support/docs/switches/catalyst-3750-series-switches/91862-cat3750-qos-config.html

  The basiq QOS model:

Qos flow :

  Ingress:

Default Queuing:

Classification and Marking:

With Policed dscp mapping :

With Policing :

Queuing, and Scheduling :

  Egress:

  Personal Notes on Qos on Cisco 2960 was originally published on blog.joostvandermade.com

[sjostke]

Verify the CUCM DB Replication

So you got a Publisher and a Subscriber. And how do you know that they are on the same page ? Is the DB Replication working correctly ?

To verify the DB Replication status you can use :

Real Time Monitoring Tool

CLI

System Reports.

RTMT :

Everything was running fine until the Sub died.

CLI :

And here there is no Sub running :

  System Reports :

Here is the result when the Sub is running, but the CUCM services are down.

This is the result you want to see when every server is up and running.

This is all nice and how do I know what kind of Replication State is needed for a good working CUCM ?

As long as you see 2, everything is up and running like it should be.

  And how to restart the DB Replication when things are failing on a server :

CLI Commands :

More information : https://supportforums.cisco.com/document/52421/troubleshooting-cucm-database-replication-linux-appliance-model

Verify the CUCM DB Replication was originally published on blog.joostvandermade.com

[sjostke]

SIP & SCCP Phone flow CUCM

Here are some flows of a SIP & SCCP phone call. My purpose was to see is it really only digit-by-digit dialing even when the phone is on hook.

SCCP

on-hook dialing : EnBloc

off-hook dialing : Digit by Digit

SIP

type B on-hook dialing no dial-rules : EnBloc

type B off-hook dialing no dial-rules : Digit by Digit with KPML event

SCCP

Normal off-hook (Digit by Digit):

Normal on-hook : (Enbloc)

Delete a number while dialing, off hook :

Change number during dialing, on hook :

SIP

off-hook normal dialing :

off-hook with BackSpace during dialing :

on-hook normal :

on-hook with BackSpace :

When you use a SIP phone with Dial-rules, it’s Enbloc !

Type A SIP Phones: Cisco Unified IP Phone models 7905, 7912, 7940 and 7960

Type B SIP Phones: Cisco IP Phone models 79×1, 79×2, 79×5, 7970 and 7960

Type A phones only support enbloc dialing when using SIP firmware.

More information can be found at the Cisco site : https://supportforums.cisco.com/document/87236/working-concept-sccp-sip-phones-and-dial-rules

SIP & SCCP Phone flow CUCM was originally published on blog.joostvandermade.com

[sjostke]

CCIE Collaboration written 400-051 notes.

Here are some thing that is nice to know. Of course check the blueprint to see what is recommended reading.

Cisco Unified IP Phone Firmware Distribution Methods

Table 1. Summary of Distribution Models

Peer Firmware Sharing Load Server Traditional TFTP

Advantages

• Hierarchy is automatic

• One download per phone model on a subnet

• Uses TCP

• Fails back to TFTP

• Speeds up LAN upgrades

• Reduces TFTP CPU load during upgrade

• Has same download time as LAN image distribution

• Distributes TFTP load over multiple TFTP servers

• Proven distribution

• Default behavior

Disadvantages

• Must be enabled on each phone

• Hierarchy is formed for each phone model

• Hierarchy is limited to subnet

• IP must be set on each phone

• Administrator must manually file copy to load server

• No failback to TFTP on error

• More prone to user error

• High-bandwidth requirements

• Multiple requests for same file

• High CPU usage on TFTP server

Link : http://www.cisco.com/c/en/us/products/collateral/collaboration-endpoints/unified-ip-phones-9900-series/white_paper_c11-583891.html

  Table 5-1 Differentiated Services Code Point (DSCP) Values for Various Types of Traffic

Traffic Type

Layer 2 Class of Service

Layer 3 IP Precedence

Layer 3 DSCP

Call signaling

3

3

CS3 (24)

Voice

5

5

EF (46)

Video

4

4

AF41 (34)

TelePresence

4

4

CS4 (32)

Link : http://www.cisco.com/c/en/us/td/docs/voice_ip_comm/uc_system/design/guides/videodg/vidguide/qos.html

ISDN Q-Interface Signaling Protocol Q.931 Tunneling over the IP Network

Transparent Tunneling of QSIG and Q.931 over SIP TDM Gateway and SIP-SIP Cisco Unified Border Element

Working concept of SCCP & SIP Phones and the Dial rules

Voice Translation Rules

Number Translation using Voice Translation Profiles

Understanding CDR (Call Detail Records)

Voice Over IP – Per Call Bandwidth Consumption

List of SIP response codes

Medianet Quality of Service Design

        CCIE Collaboration written 400-051 notes. was originally published on blog.joostvandermade.com