Troubleshooting guide

4-7
Cisco Broadband Local Integrated Services Solution Troubleshooting Guide
OL-5169-01
Chapter 4 Troubleshooting with Call Flows
Understanding MGCP
The action triggered by the signal requests is synchronized with the collection of events specified in the
request events parameter. For example, if the notification request mandates “ringing” and the event
request asks to look for an “off-hook” event, the ringing should stop as soon as the phone goes off-hook.
In order to stop tone generation, the call agent can send a notification request whose signal list is empty.
Digit Map (D)
Digit map is an optional parameter that allows the call agent to provision the gateways with a digit map
that specifies how digits are accumulated. This parameter must be present if the requested events contain
a request to “accumulate according to digit map.”
The collection of digits results in a digit string. The digit string is initialized to a null string upon receipt
of a request, so that a subsequent request returns only digits that were collected between the two
requests.
Observed Events (O)
Observed events is a list of event detected by the gateway. The event codes are the same as those used in
the notification request.
A single notification may report a list of events, which are reported in the order in which they were
detected. The list may contain only the events that were requested in the requested events parameter of
the triggering request.
Dial tone dl
Intercept tone it
Network congestion tone cg
Busy tone bz
Confirm tone cf
Answer tone aw
Call waiting tone wt
Off hook warning tone ot
Preemption tone pt
Continuity tone (default) co
Continuity tone (single tone) co1
Continuity test (go tone, in dual tone
procedures)
co2
Continuity verified (response tone, in dual
tone procedures)
cv
DTMF tones A string composed of the individual digits that should
be played on the endpoint.
ASDI display The keyword ad, followed by the string to be
displayed, in parentheses.
Example: Ad(123456 Your friend)
Table 4-5 Signal Requests (continued)
Signal Code