Specifications

170 IBM Voice Over Frame Relay Perform Guide
Figure 59. Examples of ELS Trace for Answering an Incoming Call
ELS has been updated with a new subsystem - VOIC. There are only four
messages, which are shown in Figure 58, where %-7s is the type of message,
sub %d is the processing subchannel ID and CIR %d is the payload subchannel
ID, NID is the node ID.
VOIC.001: “A Call Processing Packet has been received and transmitted on the
indicated interfaces.”
VOIC.002: “A Locally Generated Call Processing Packet has been transmitted on
the indicated interface.”
VOIC.003: “A Call Processing Packet has been received on the indicated
interface and discarded as unroutable.”
VOIC.004: “A possible configuration error affecting voice operation has been
detected for the specified interface.”
Note that the call setup packet actually contains the circuit number. The 2212
doesn’t have the concept of circuit numbers - the circuit number is the same as
payload subchannel ID.
Some samples of ELS messages are shown in Figure 59 and on the next page.
The ELS message shown in Figure 59 shows that a call setup has been received
from network 0, which is FR/0. The messages show that the processing
messages were on subchannel 8 and the payload on subchannel 9. It was
generated by the voice port with a node ID of 2.0.0.2, and the dialed digits were
101. The next message confirms that a call connect message was issued by
voice/0, which is network 4, and it was transmitted out of network 0. A call
connect message confirms to the originating side that the call setup was
received. The next message is generated when the user answers the phone. As
the call release message has been received on network 0, this implies that the
other end terminated the conversation. In the next message the local node also
sends a call release as the local user hangs up the telephone.
The cause codes for the release messages are:
0x00 Normal Call Clearing
0x01 Response to RELEASE
0x02 No Local Bandwidth
0x03 No Remote Bandwidth
0x04 Local Channel Busy
00:00:33 VOIC.001: Call Setup recv nt 0 int FR/0, trans nt 4 int Voice/0
DLCI 16 sub 8 cir 9 NID 2.0.0.2 Dest 101
00:00:33 VOIC.001: Call Connect recv nt 4 int Voice/0, trans nt 0 int FR/0
DLCI 16 sub 8 cir 9 NID 1.0.0.1
00:00:35 VOIC.001: Call Answer recv nt 4 int Voice/0, trans nt 0 int FR/0
DLCI 16 sub 8 cir 9 NID 1.0.0.1
00:00:38 VOIC.001: Call Release recv nt 0 int FR/0, trans nt 4 int Voice/0
DLCI 16 sub 8 cir 9 NID 2.0.0.2 Cause 0
00:00:38 VOIC.001: Call Release recv nt 4 int Voice/0, trans nt 0 int FR/0
DLCI 16 sub 8 cir 9 NID 1.0.0.1 Cause 1