Appendix B: Integrating Cisco Unified Communications Manager and Cisco Unified SRST to Use Cisco Unified SRST
How to Use Cisco Unified SRST Gateways as a Multicast MOH Resource
303
Cisco Unified SCCP and SIP SRST System Administrator Guide
OL-13143-04
Troubleshooting Tips
•
If the PSTN caller hears tone on hold (TOH) instead of MOH, two problems are probable:
–
Cisco Unified CM has failed to activate MOH and has used TOH as a fallback. To verify that
this is the case, see the
“Verifying Cisco Unified Communications Manager Multicast MOH”
section on page 296
.
–
Cisco Unified CM does not have the appropriate MOH resource available. Use the
show
ccm-manager music-on-hold
command to find out if the MOH resource is the problem.
Step 3
debug h245 asn
Example:
Router# debug h245 asn
*Mar 1 04:20:19.227: H245 MSC INCOMING PDU ::=
value MultimediaSystemControlMessage ::= response :
openLogicalChannelAck :
{
forwardLogicalChannelNumber 6
forwardMultiplexAckParameters
h2250LogicalChannelAckParameters :
{
sessionID 1
mediaChannel unicastAddress : iPAddress :
{
network 'EF010101'H
tsapIdentifier 16384
}
mediaControlChannel unicastAddress : iPAddress :
{
network 'EF010101'H
tsapIdentifier 16385
}
}
}
Use this command if H.323 is being used and no
multicast address appears in the
show
ccm-manager music-on-hold
command output
to verify the H.323 handshaking between Cisco
Unified Communications Manager and the
Cisco Unified SRST gateway. When a PSTN
caller is placed on hold, Cisco Unified
Communications Manager sends an H.245
closeLogicalChannel, followed by an
openLogicalChannel. Verify that the final
openLogicalChannelAck from Cisco Unified
Communications Manager to the Cisco Unified
SRST gateway contains the expected multicast
IP address and port number. In the following
example, the IP address is EF010101 (239.1.1.1)
and the port number is 16384.
Step 4
show call active voice
Example:
Router# show call active voice | include RemoteMedia
RemoteMediaIPAddress=239.1.1.1
RemoteMediaPort=16384
Use this command with the
debug h245 asn
command to further verify the H.323
handshaking between Cisco Unified
Communications Manager and the Cisco
Unified SRST gateway.
The IP address and port number displayed must
match the IP address and port number displayed
by the
debug h245 asn
command. If the
RemoteMediaIPAddress field displays 0.0.0.0,
you probably have encountered caveat
CSCdz00697. For more information, see the
Cisco
Bug ToolKit
and the
“Restrictions for
Using Cisco Unified SRST Gateways as a
Multicast MOH Resource” section on page 282
.
Command or Action
Purpose
