Technical Reference for ZyXEL omni.net series
8-8
available for more flexibility, as shown below:
AT&J0
Disables B-channel bundling.
AT&J1
Enables B-channel bundling in answer mode only.
AT&J2
Enables B-channel bundling in call mode only.
AT&J3
Enables B-channel bundling in both call and answer modes.
Once this is done, the [ATD] command will generate two consecutive SETUP messages to invoke bundle
initiation.
For the Northern Telecom switch, each BRI phone number can only be called once at any given time. So if
you dial this number, it will report "busy" to any other incoming calls. In order to use two B-channels for
aggregation, we must place two calls with different phone numbers. To do this, separate the two numbers with
a “+” sign after the ATD command, as shown below:
&
ATDI[phone_number_1]+[phone_number_2]<Enter>
The answering ISDN TA determines that the call is a bundle request: when AT&J3 is set, and two consecutive
SETUP messages are received. The two data calls are established as one message. The phone company's
ISDN line splits it off into two messages. That is, the ISDN network treats them as two independent calls.
Finally, the receiving side receives one bundled message into its computer's serial port.
The success of a bundle connection initiation is indicated by the connect message reported to the DTE:
&
CONNECT 115200/V120M 128K/LAPD
Or
&
CONNECT 115200/V120M 128K/LAPD/V42b
(with data compression)
Table 49. V.120 Bundled Call AT Command (2)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
