1 00:00:08,220 --> 00:00:13,170 Now let's talk about a concept that a lot of engineers struggle with which is incoming and outgoing 2 00:00:13,170 --> 00:00:17,140 Gulp is for incoming and outgoing call legs. 3 00:00:17,190 --> 00:00:23,100 The first thing to remember is always look at adult is from the point of view of the road not from the 4 00:00:23,100 --> 00:00:24,600 phone's point of view. 5 00:00:24,630 --> 00:00:34,050 In other words from the rudest point of view when 1000 phones 1001 there is an incoming call from 1000 6 00:00:34,140 --> 00:00:41,920 and an outgoing call to 1001 so from the writer's point of view there is an incoming call late or incoming 7 00:00:41,930 --> 00:00:42,720 WPA. 8 00:00:42,850 --> 00:00:46,220 When the call arrives from telephone 1000. 9 00:00:46,240 --> 00:00:53,330 So this is an incoming call leg when the call is established to 1001. 10 00:00:53,390 --> 00:00:56,530 That is an outgoing call leg or outgoing dull. 11 00:00:56,560 --> 00:01:01,590 Yeah essentially what happens is the rudder breaks the call up into two parts. 12 00:01:01,730 --> 00:01:09,580 There's the initial call setup from 1000 which is the incoming call leg or incoming Delta the second 13 00:01:09,580 --> 00:01:16,590 half is the establishment of the call to 1001 which is the outgoing call leg or outgoing Delta. 14 00:01:16,780 --> 00:01:21,550 The rudder then combines those to call legs into an internal call. 15 00:01:22,210 --> 00:01:29,050 So we have an incoming call leg and an outgoing call leg to separate calls if you're like or half of 16 00:01:29,050 --> 00:01:34,540 calls which are then bonded together or joined together to form the into n call. 17 00:01:34,540 --> 00:01:39,700 So from the writer's point of view there are two cool legs involved in the establishment of a call from 18 00:01:39,700 --> 00:01:42,130 1000 to 1001. 19 00:01:42,220 --> 00:01:48,890 You have what's called the incoming call leg once again and the outgoing call leg or a call to be established. 20 00:01:48,930 --> 00:01:52,970 There must always be an incoming call leg and an outgoing call leg. 21 00:01:53,070 --> 00:01:58,640 So how does the rider choose which does appear to use as the incoming call leg and which doubled it 22 00:01:58,650 --> 00:02:04,230 to use as the outgoing call leg on our original configuration with these two phones. 23 00:02:04,230 --> 00:02:12,630 We created to Dalby as we credit adults for phone 1000 and we created adult here for phone 1001 so our 24 00:02:12,630 --> 00:02:21,120 configuration would look as follows is adult Pier 1 puts this nation pattern 1000 pointing to the first 25 00:02:21,120 --> 00:02:27,390 port of 0 selection errors there 0 and there's another plot style here pointing to 1001 on the second 26 00:02:27,390 --> 00:02:28,450 port. 27 00:02:28,480 --> 00:02:34,160 Now when a call arrives on the road it the first thing you need to look at is the direction of the call. 28 00:02:34,170 --> 00:02:40,260 So in this example when 1000 phones 1001 the direction is from right to left. 29 00:02:40,980 --> 00:02:47,280 So the call is arriving from 1000 going to 1001. 30 00:02:47,280 --> 00:02:54,180 So from the riders point of view the incoming dot here that is used for 1000 is this all doll. 31 00:02:54,180 --> 00:03:01,290 Pier 1 even though the word destination pattern is configured in the doll pier and this example the 32 00:03:01,290 --> 00:03:04,860 destination pattern is not used as the destination pattern. 33 00:03:04,860 --> 00:03:12,950 It's used as the DNI automatic no identification or CSI whichever term you prefer the caller line ID. 34 00:03:13,080 --> 00:03:17,860 So 1000 is the CLIA that is allocated to the phone. 35 00:03:17,970 --> 00:03:19,440 I'm going to demonstrate this in a moment. 36 00:03:19,760 --> 00:03:21,590 So you'll see exactly what I mean. 37 00:03:21,870 --> 00:03:27,490 But essentially the call is coming from 1000 going to 1001 so dull. 38 00:03:27,500 --> 00:03:34,800 Pier 1 with destination pattern 1000 is uses the incoming WBA adult Pier 2 with this nation pattern 39 00:03:34,800 --> 00:03:36,050 1001. 40 00:03:36,040 --> 00:03:39,160 It uses the outgoing pier. 41 00:03:39,210 --> 00:03:41,210 The reason why is from the rudest point of view. 42 00:03:41,220 --> 00:03:50,100 The call arrived from 1000 and was made to 1001 so it does establish that into then call an incoming 43 00:03:50,100 --> 00:03:56,190 Dole is allocated to this part of the call or call lake and an outgoing adult is allocated to the second 44 00:03:56,190 --> 00:03:57,810 part of the call leg. 45 00:03:57,990 --> 00:04:03,510 The thing to remember is that they are to call legs in this example an incoming call leg and an outgoing 46 00:04:03,510 --> 00:04:12,170 call leg to call legs make the implement call the let's set up a call between this optic communicator 47 00:04:12,440 --> 00:04:18,740 and the optic communicator en route a team so that I can explain some more detail so it's important 48 00:04:18,740 --> 00:04:26,750 to realize that we've got two IP communicators 1004 is registered to the U.S. Five hundred and two thousand 49 00:04:26,750 --> 00:04:30,370 is registered to write it to the going will hook 50 00:04:36,630 --> 00:04:39,930 you can see the call from two thousand two 1004 successful 51 00:04:46,120 --> 00:04:54,770 and I can answer the call and then muted in our example when the call was made from 1004 to thousand. 52 00:04:54,900 --> 00:05:02,700 There was an incoming call leg to the Rada member using the hidden power created by the E F export. 53 00:05:02,790 --> 00:05:09,660 There is an outgoing dollop here from the U.S. 520 V to the VoIP infrastructures so there is an outgoing 54 00:05:09,870 --> 00:05:14,480 VoIP up here on CMC 2 or added two's point of view. 55 00:05:14,480 --> 00:05:22,340 There is an incoming VoIP here and an aunt going hidden pot style peer to the E F access port for the 56 00:05:22,340 --> 00:05:31,910 IP communicator so they are for double peers or for call legs when a call is made from 1040 2000 just 57 00:05:31,910 --> 00:05:33,250 to go through that again. 58 00:05:33,320 --> 00:05:36,920 There is an incoming Potts doll here it's hidden. 59 00:05:36,920 --> 00:05:41,300 It was created when we created the iPhone the for IP phones. 60 00:05:41,420 --> 00:05:44,000 There is an outgoing voice adult here. 61 00:05:44,000 --> 00:05:51,050 There is an incoming VoIP Delta on Roddick 2 and an outgoing hot stop here for the hidden e f access 62 00:05:51,050 --> 00:05:53,580 port for the IP communicator. 63 00:05:53,630 --> 00:06:01,780 So in other words they are for is if we made a call from the IP communicator to the BlackBerry from 64 00:06:01,780 --> 00:06:04,110 the U.S. 500 point of view. 65 00:06:04,150 --> 00:06:11,530 There is an incoming stop here for the hidden E F X a sport and there is an outgoing port stalled on 66 00:06:11,530 --> 00:06:20,830 the ethics O port to get to the PSTN so they are two dull PS so to demonstrate the concept of cool legs 67 00:06:21,160 --> 00:06:27,990 I'm going to make a call from 1000 to 1001 and you should see that from the rudest point of view. 68 00:06:28,000 --> 00:06:31,980 There is an incoming Delta and an outgoing Delta. 69 00:06:32,110 --> 00:06:37,510 The point to remember is always look at Delta is from the rudest point of view not from the phone's 70 00:06:37,510 --> 00:06:38,330 point of view. 71 00:06:38,560 --> 00:06:48,610 When 1000 phones 1001 is an incoming Delta from 1000 and an outgoing does appear to 1001 if the call 72 00:06:48,610 --> 00:06:53,700 was made in the reverse direction it would be an incoming Dolby for this phone one thousand and one 73 00:06:54,160 --> 00:07:00,570 and an outgoing dollop if for 1000 so teleporting to the U.S. 500 74 00:07:05,350 --> 00:07:15,370 I can do the command debug voice C.C. API in out top to month so we can see the DB bucks please be very 75 00:07:15,370 --> 00:07:19,980 careful with this come on in the real world because it's going to produce a lot of output so I'll go 76 00:07:20,030 --> 00:07:20,950 hook on 1000 77 00:07:23,790 --> 00:07:27,840 and you can see already there is a lot of output there and then I'll go on hook again. 78 00:07:34,520 --> 00:07:37,830 So going through the output there's the debug that we typed 79 00:07:40,860 --> 00:07:46,470 you can see here for instance it's a non ISDN call because we making a call from an analog phone and 80 00:07:46,470 --> 00:07:51,060 what I want to point out is notice yet says incoming Delta 1. 81 00:07:51,300 --> 00:07:56,780 The reason why is the call is being made from telephone number 1000. 82 00:07:56,800 --> 00:08:05,040 So that is the source of the call topping the come on show dial dash fear voice summary shows me that 83 00:08:05,040 --> 00:08:12,530 Delta 1 has been configured with telephone number one thousand on Port 0 6 0 7 0 84 00:08:15,970 --> 00:08:24,230 so when I made a call call it originating from 1000 and thus the incoming DOL peers Pier 1 85 00:08:29,040 --> 00:08:36,540 other information to take note of is the digit timeout and into digit timeout by default set to 10 seconds 86 00:08:36,900 --> 00:08:43,200 you have ten seconds when going off foot to put in your first digit and 10 seconds between each digit 87 00:08:43,230 --> 00:08:46,110 before a call is attempted all the call is torn down 88 00:08:50,410 --> 00:08:53,820 so let's go fuck again. 89 00:08:53,890 --> 00:09:03,410 Now I'm gonna double my first digit and you can see the digit that I dialed was 1 second digit. 90 00:09:03,440 --> 00:09:08,010 You can see it's digit zero third digit. 91 00:09:08,090 --> 00:09:10,240 You can see at zero last digit 92 00:09:13,470 --> 00:09:17,160 and you can hear the phone ring and I've just disconnected the call. 93 00:09:17,250 --> 00:09:26,200 Notice that they called Disconnect so if we go through the output again notice yet says outgoing Delta 94 00:09:26,380 --> 00:09:28,400 is Delta 2. 95 00:09:28,450 --> 00:09:36,640 The call is coming from one thousand notice it says Cisco a Anni or automatic no ID or to put into other 96 00:09:36,640 --> 00:09:44,560 terms that people may use calling line ID so see a lie or cell I.D. or meaning. 97 00:09:44,560 --> 00:09:46,790 This is the calling party no. 98 00:09:47,110 --> 00:09:49,900 Notice the destination number is 1001. 99 00:09:50,440 --> 00:09:55,960 But what I want you to take note of these is that the incoming Delta was one and the outgoing gulp is 100 00:09:55,970 --> 00:10:04,260 to show dial dash give voice summary shows us incoming DLP is one. 101 00:10:04,280 --> 00:10:12,880 The call is coming from one thousand outgoing Delta is to call is going to 1001 so back to our simple 102 00:10:12,880 --> 00:10:13,960 example. 103 00:10:13,960 --> 00:10:16,690 We've got a call from 1000 to 1001. 104 00:10:16,780 --> 00:10:21,570 They're going to be to call legs an incoming and outgoing call leg. 105 00:10:21,750 --> 00:10:28,870 So how are incoming colleagues chosen and how are outgoing colleagues chosen if you've only got two 106 00:10:28,870 --> 00:10:31,510 adult is like in this example. 107 00:10:31,510 --> 00:10:38,690 When the call is made from 1000 to 1001 the destination pattern is used for the CLIA. 108 00:10:39,290 --> 00:10:46,630 So in other words DLP one becomes the incoming bulkier and don't get to becomes the outgoing or outgoing 109 00:10:46,630 --> 00:10:47,640 colleague. 110 00:10:47,950 --> 00:10:55,830 When a call is made from 1001 to 1000 then does appear to becomes the incoming bulkier or incoming call 111 00:10:55,830 --> 00:11:01,610 leg and Dulcie one becomes the outgoing call leg or outgoing gulp. 112 00:11:01,960 --> 00:11:09,850 So the direction of the call affects whether adult is used as the incoming or outgoing DLP it unfortunately 113 00:11:09,850 --> 00:11:15,390 can get more complicated than that to choose an incoming WTO inbound all year. 114 00:11:15,480 --> 00:11:21,490 The route to makes the following decision it firstly looks for adult here with this command incoming 115 00:11:21,490 --> 00:11:28,990 cold no which essentially matches the dial number information service or called number or the number 116 00:11:28,990 --> 00:11:32,150 that you dialed to adult peer. 117 00:11:32,260 --> 00:11:38,520 We haven't configured incoming call numbers in our topology but if you had configured an incoming call 118 00:11:38,540 --> 00:11:45,220 number on one of the dope is that adult here would more likely be chosen as the incoming here than others 119 00:11:45,490 --> 00:11:50,030 because the first choice for an incoming adult is based on incoming cold. 120 00:11:50,860 --> 00:11:58,810 This applies to VoIP Potts T1 E1 cars an ISDN bulb is the second choice is based on what's called answer 121 00:11:58,830 --> 00:12:06,890 address which looks for adult here with a command answer address matching the calling number or call 122 00:12:06,890 --> 00:12:10,560 on ID or automatic no identification. 123 00:12:10,570 --> 00:12:16,540 In other words the number that you're calling from it also applies to white clutch t want you on cars 124 00:12:16,930 --> 00:12:18,790 and ISDN is. 125 00:12:18,850 --> 00:12:24,850 So in other words if you've configured a list of dolphins and one of them has incoming call number and 126 00:12:24,850 --> 00:12:29,980 one of them has answer address incoming call number is more likely to be chosen. 127 00:12:29,980 --> 00:12:31,880 I'll show you an example in a moment. 128 00:12:31,930 --> 00:12:33,700 So the first choice is incoming calls. 129 00:12:33,710 --> 00:12:41,500 No second choices answer address and only then is the third choice of incoming bulkier chosen based 130 00:12:41,500 --> 00:12:47,860 on Destination pattern which uses once again the calling number or a Anni to determine the incoming 131 00:12:47,860 --> 00:12:54,420 double yet if none of that is configured then the Rada uses the port to match on an incoming bulkier 132 00:12:55,210 --> 00:13:00,530 set matches the config adult port to the voice port that is associated with incoming call. 133 00:13:00,760 --> 00:13:08,020 That only applies to what stop is because VoIP adult is don't arrive on a port they arrive on an interface. 134 00:13:08,350 --> 00:13:13,570 And if we can match on any of those then we match on a special piece called doll Pier 0. 135 00:13:14,380 --> 00:13:21,130 So let me show you an example to try and clear this up he has a sample topology where we've got 1000 136 00:13:21,400 --> 00:13:27,840 phoning 1000 or 1 and we want to set up an intra in call the right in each to choose an incoming Delta 137 00:13:28,120 --> 00:13:37,240 and an outgoing call yet so the call is made from 1000 to 1000 and one set to match the incoming dob 138 00:13:37,250 --> 00:13:39,710 in the first half of the poll. 139 00:13:39,790 --> 00:13:44,210 Which of the following would be chosen as the incoming bulb. 140 00:13:44,710 --> 00:13:47,710 If we had configured these three adult is on the route. 141 00:13:47,890 --> 00:13:56,170 Notice we've got adult here one incoming cold number 1001 we've got adult voice 2 Potts answer address 142 00:13:56,170 --> 00:13:59,380 one thousand and Delta three parts. 143 00:13:59,620 --> 00:14:01,910 Destination pattern 1000. 144 00:14:02,020 --> 00:14:04,790 Going back to our list of choices. 145 00:14:05,200 --> 00:14:13,150 The first choices based on incoming call number which is based on DNS so the caller arrives at the Rada 146 00:14:13,780 --> 00:14:22,170 it's made from 1000 to 1001 so you must agree that this will match because the called number or dialled 147 00:14:22,180 --> 00:14:26,060 number or DNS number is 1001. 148 00:14:26,230 --> 00:14:34,300 However the C ally also matches answer address and destination pattern but based on what choices this 149 00:14:34,300 --> 00:14:41,200 is chosen first just to remind you first choices choices incoming call no second choices answer address 150 00:14:41,260 --> 00:14:44,200 and third choices destination pattern. 151 00:14:44,200 --> 00:14:49,680 So in this example gold tier 1 is chosen as the incoming gold here. 152 00:14:50,140 --> 00:14:57,640 If we hadn't configured WPA 1 we had only configured these two dolphins then appear to would be chosen 153 00:14:58,000 --> 00:15:02,660 because answer address is chosen before destination pattern. 154 00:15:02,740 --> 00:15:09,970 If we hadn't configured adult there one or Dota 2 and had only configured adult get 3 then this dull 155 00:15:09,970 --> 00:15:16,750 pair would be chosen as the incoming dolphin here because that's the third choice in our list remembered 156 00:15:16,810 --> 00:15:22,680 incoming call no answer address in the destination pattern and we haven't configured an incoming call 157 00:15:22,680 --> 00:15:24,360 number or answer address. 158 00:15:24,550 --> 00:15:30,550 So the next choice is destination pattern if none of those had been configured then the dull pair would 159 00:15:30,550 --> 00:15:37,630 be chosen based on the port if it was a VoIP call as an example or we couldn't use the port then Delta 160 00:15:37,650 --> 00:15:46,270 0 would be use an incoming Delta and an outgoing Delta has to always be chosen if you hadn't configured 161 00:15:46,330 --> 00:15:55,150 any incoming Delta is Delta 0 would be chosen as it said both in here when nothing else matches so when 162 00:15:55,150 --> 00:16:01,900 there's no match the rider will use adult is zero you can configure adult is zero you can't manipulate 163 00:16:01,900 --> 00:16:09,280 it it is bolted to the Iaw and has the following properties none of which you can change so as an example 164 00:16:09,280 --> 00:16:17,020 you cannot disable that you cannot enable X relay if at all possible you should try and avoid the use 165 00:16:17,020 --> 00:16:23,110 of gulp is zero because you cannot control the setting you should always configure your Rada with an 166 00:16:23,140 --> 00:16:25,110 incoming and outgoing Delta.