Cisco OL-4015-08 Guide de dépannage télécharger pdf (Page 135)

4-9

Cisco Broadband Local Integrated Services Solution Troubleshooting Guide

OL-5169-01

Chapter 4 Troubleshooting with Call Flows

Understanding MGCP

Example:

P: PS=1245, OS=62345, PR=0, OR=0, PL=0, JI=0, LA=48

Reason Code (E)

In some circumstances, a gateway may have to clear a connection; for example, it may have lost the

resource associated with the connection, or detected that the endpoint no longer is capable or willing to

send or receive voice. The gateway terminates the connection using a form of the delete connection

request that includes a reason code. The reason code indicates the cause of the disconnection.

Return Codes and Error Codes

All MGCP requests are acknowledged. The acknowledgment includes a return code that indicates the

status of the request. The return code has the follow three ranges of values:

• 200 to 299 indicates a successful completion

• 400 to 499 indicates a transient error

• 500 to 599 indicates a permanent error

Defined values include:

200— the requested transaction executed normally

250—the connection was deleted

400—the transaction could not be executed due to a transient error

401—the phone is already off the hook

402—the phone is already on the hook

500—the transaction could not be executed because the endpoint is unknown

501—the transaction could not be executed because the endpoint is not ready

502—the transaction could not be executed because the endpoint does not have sufficient resources

510—the transaction could not be executed because a protocol error was detected

Jitter JI Average inter-packet arrival jitter in milliseconds, expressed

as an unsigned integer. Jitter is defined as the mean deviation

(smoothed absolute value) of the difference in packet spacing

at the receiver compared to the sender for a pair of packets.

Detailed computation algorithms are found in RFC 1889. The

value is zero if the connection was set in “send only” mode.

Latency LA Average network latency expressed in milliseconds. It is the

average value of the difference between the sender’s NTP

timestamp of the RTCP messages and the receiver’s NTP

timestamp, measured when the messages are received.

1. The count is not reset if the sender changes its SSRC identifier, for example, as a result of a modify command. The value is

zero if the connection was set in “receive only” mode.

2. The count is not reset if the sender changes its SSRC identifier, for example, as a result of a modify command. The value is

zero if the connection was set in “send only” mode.

Table 4-6 Types of Connection Parameters (continued)

Connection Parameter Name Code Value

1 2 ... 130 131 132 133 134 135 136 137 138 139 140 ... 369 370

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