Cisco took this doc and put it online http://www.cisco.com/en/US/tech/tk801/tk379/technologies_configuration_example09186a0080094316.shtml
Originally it had a credit of my name on the doc, but later they removed it :-(
(May2001)
We recently purchased a Cisco AS5350 modem server for use in our ISP business. In the past we had been using Lucent Portmaster 3's, but had decided to change to Cisco after Lucent discontinued the Portmaster range.
On the Portmasters we are able to accept incoming analog, ISDN and Data-Over-Voice (DoV) calls on a single dial-up number without needing any special configuration. From what I have read, the Portmaster is about the only product available that can do this.
After reading the docs for the Cisco, we found that the Cisco servers can also accept all three of these call types, but it has the common limitation of not being able to handle the situation where you have both analog and DoV calls arriving on the same dialed phone number. The Cisco will successfully detect that both of these call types are "voice", but when you are configure the Cisco's PRI interface, you can only choose to send all voice calls to the modems (ie analog) or send all voice calls to the ISDN ports (ie DoV)
interface Serial3/0:15 ! Send all voice calls through to the modems ! This will allow analog calls to work, but will break DoV isdn incoming-voice modem ! or interface Serial3/0:15 ! Send all voice calls through to the ISDN ports ! This will allow DoV calls to work, but will break analog isdn incoming-voice data ! |
This is a problem if you have both analog and DoV calls are arriving on that PRI. By using the commands shown above, you are going to end up sending some calls to the wrong place. If you send a DoV call to the modems, or an analog call to the ISDN ports, the call will not be successful due to the mismatch of technologies.
What is needed is a way to program the Cisco so that it can pick the difference between analog and DoV calls, and automatically route the calls to the correct resources.
Cisco have a page "BRI-to-PRI Connection Using Data Over Voice" which discusses the issues involved with DoV. They say on this page that if you want to be able to support both DoV and analog calls on the same PRI, you need to setup "resource pools". Resource pools are very powerful and allow you to define how to handle incoming calls based on various criteria such as username, dialed number (DNIS), caller-id etc.
After reading up a bit further on resource pools, it sounded like resource pools using DNIS lookups would allow us to get a working configuration.
Our Cisco currently has a 30 line PRI attached to it. This PRI has been configured by the telephone company to have a main number (52731600), as well as a "100 number indial range". The 100 line indial range gives us the ability for this PRI to answer calls to any phone numbers in the range 52731600 through to 52731699.
Next we had a think about the best way to setup the server to make it as simple as possible for customers to get a working connection. The majority of our customers are using either analog or ISDN for dial-in, so we wanted the Cisco to be able to accept these these types of calls on our advertised main number (52731600). Then we decided we would make make another number available for people to call should they want to use DoV. In our case we decided to use the number 52731601. By configuring the server this way, we avoided the problem of having the two sorts of "voice" calls (analog and DoV) arriving on the same dialed number.
The Cisco then needed to be configured to use "resource pools" to route the incoming call through to the appropriate Cisco resource (analog calls should be routed to the modems, ISDN and DoV calls routed to the ISDN ports)
To get resource pools working on the Cisco, you have to configure three things :
The combination of DNIS groups and profiles give the Cisco all the info it needs to dynamically route any incoming call through to the correct resource.
Here are the actual Cisco commands that we used to achieve this :
| Enable Cisco resource pooling : ===================== resource-pool enable Setup the resources : resource-pool group resource RESOURCE-ISDNPORTS
! Allocate all the ISDN ports to this group
! (our cisco AS5350 has 2 * PRI's = 60 lines)
range limit 60
resource-pool group resource RESOURCE-SPEMODEMS
! allocate all the modem ports to this group
! (Our cisco AS5350 has a 60 port modem card installed in slot 1)
range port 1/0 1/59
Setup the DNIS groups : dialer dnis group DNIS-ALL-BUT-DOV
! listen for calls arriving on following number
! This is the number that we will be using for ISDN and Analog
number 52731600
dialer dnis group DNIS-DOV
! listen for calls arriving on the following number
! this is the number that we will be using for DoV
number 52731601
Define the profiles : resource-pool profile customer CUSTOMER-ALL-BUT-DOV
! Accept calls made to the numbers defined in the following DNIS group
! ie 52731600
dnis group DNIS-ALL-BUT-DOV
! send any voice calls to the modems
resource RESOURCE-SPEMODEMS speech
! send any ISDN calls to the ISDN ports
resource RESOURCE-ISDNPORTS digital
resource-pool profile customer CUSTOMER-DOV
! Accept calls made to the numbers defined in the following DNIS group
! ie 52731601
dnis group DNIS-DOV
! send any voice calls to the ISDN ports (DoV)
resource RESOURCE-ISDNPORTS speech
resource-pool profile customer CUSTOMER-DEFAULT
! Any calls that do not match the defined DNIS groups end up here
! ie 52731602 through to 52731699
dnis group default
|
And the final thing you need to configure is to set your PRI for "isdn incoming-voice modem"
interface Serial3/0:15 isdn incoming-voice modem ! |
Once we had all these settings in place, then everything worked as expected.
Analog and ISDN calls are successfully received on 52731600
DoV calls are successfully received on 52731601
There are 3 combinations possible for incoming calls in my example
Combination 1 : analog modem call to 52731600
Call arrives at the server
Resource pool looks up the DNIS and sees 52731600
This phone number is mapped to the dnis group DNIS-ALL-BUT-DOV
Resource pools this send the call through to the CUSTOMER-ALL-BUT-DOV profile
The CUSTOMER-ALL-BUT-DOV profile checks the call type
After seeing the call type is "speech", it directs the call through to the modems
Combination 2 : isdn call to 52731600
Call arrives at the server
Resource pool looks up the DNIS and sees 52731600
This phone number is mapped to the dnis group DNIS-ALL-BUT-DOV
Resource pools this send the call through to the CUSTOMER-ALL-BUT-DOV profile
The CUSTOMER-ALL-BUT-DOV profile checks the call type
After seeing the call type is "digital", it directs the call through to the isdn ports
Combination 3 : dov call to 52731601
Call arrives at the server
Resource pool looks up the DNIS and sees 52731601
This phone number is mapped to the dnis group DNIS-DOV
Resource pools this send the call through to the CUSTOMER-DOV profile
The CUSTOMER-DOV profile checks the call type
After seeing the call type is "speech", it directs the call through to the isdn ports
So, the final configuration of the AS5350 was :
! ! Last configuration change at 13:23:04 aes Fri Jun 22 2001 ! NVRAM config last updated at 13:05:48 aes Fri Jun 22 2001 by XXX ! version 12.1 no parser cache no service single-slot-reload-enable service timestamps debug uptime service timestamps log uptime service password-encryption ! hostname as5350-1 ! boot system flash c5350-is-mz.121-5.XM3.bin no boot startup-test no logging buffered logging rate-limit console 10 except errors no logging console aaa new-model aaa authentication login STORE_LOCAL local aaa authentication login RADIUS_USER group radius aaa authentication login LINE_PASSWD line enable aaa authentication login CONSOLE none aaa authentication enable default enable aaa authentication ppp default group radius aaa authorization network default group radius aaa accounting network default start-stop group radius enable secret 5 XXXXXXXX ! username XXXXXXXX password XXXXXXXX ! resource-pool enable ! resource-pool group resource RESOURCE-ISDNPORTS range limit 60 ! resource-pool group resource RESOURCE-SPEMODEMS range port 1/0 1/59 ! resource-pool profile customer CUSTOMER-ALL-BUT-DOV limit base-size all limit overflow-size 0 resource RESOURCE-ISDNPORTS digital resource RESOURCE-SPEMODEMS speech dnis group DNIS-ALL-BUT-DOV ! resource-pool profile customer CUSTOMER-DOV limit base-size all limit overflow-size 0 resource RESOURCE-ISDNPORTS speech dnis group DNIS-DOV ! clock timezone aes 10 calltracker enable calltracker call-record verbose facility-alarm detect controller E1 3/0 facility-alarm detect temperature facility-alarm detect fan facility-alarm detect modem-board 1 facility-alarm detect rps ! spe country australia ! spe log-size 30 ! spe call-record modem ! ! ! ! ! voice-fastpath enable ip subnet-zero no ip source-route no ip finger ip domain-name XXXXXXXX ip name-server XXX.XXX.XXX.2 ip name-server XXX.XXX.XXX.3 ! virtual-profile virtual-template 4 virtual-profile aaa ! multilink virtual-template 4 multilink bundle-name both async-bootp time-server XXX.XXX.XXX.XXX async-bootp dns-server XXX.XXX.XXX.XXX XXX.XXX.XXX.XXX isdn switch-type primary-net5 call rsvp-sync ! ! ! ! ! fax interface-type modem mta receive maximum-recipients 0 ! ! ! controller E1 3/0 pri-group timeslots 1-31 description ** Telstra OnRamp30 FNN A0352731600K1001 ! controller E1 3/1 shutdown pri-group timeslots 1-31 ! ! interface Loopback0 no ip address ! interface Loopback1 description ** Create a /26 network advertisement for the dialin pool ip address XXX.XXX.XXX.0 255.255.255.192 ! interface FastEthernet0/0 description Pipeline Internet Geelong POP LAN ip address XXX.XXX.XXX.XXX 255.255.255.0 no ip redirects ip ospf authentication-key XXXXXXXXXXX ip ospf priority 50 duplex auto speed auto ! interface FastEthernet0/1 no ip address shutdown duplex auto speed auto ! interface Serial0/0 no ip address shutdown clockrate 2000000 ! interface Serial0/1 no ip address shutdown clockrate 2000000 ! interface Serial3/0:15 description ** Configuration settings for 1st PRI no ip address encapsulation ppp ip tcp header-compression passive ip mroute-cache dialer rotary-group 2 dialer-group 1 isdn switch-type primary-net5 isdn incoming-voice modem no fair-queue no cdp enable ! interface Serial3/1:15 description ** Configuration settings for 2nd PRI no ip address encapsulation ppp ip tcp header-compression passive ip mroute-cache shutdown dialer rotary-group 2 dialer-group 1 isdn switch-type primary-net5 isdn incoming-voice modem no fair-queue no cdp enable ! interface Virtual-Template4 description ** configuration cloned to all dialin users ip unnumbered Loopback1 peer default ip address pool AS5350-1-POOL ppp max-bad-auth 3 ppp authentication pap ppp ipcp dns XXX.XXX.XXX.XXX XXX.XXX.XXX.XXX ppp multilink ! interface Group-Async0 description ** Configuration cloned to all async lines ip unnumbered Loopback1 ip tcp header-compression passive dialer in-band dialer rotary-group 2 dialer-group 1 async mode dedicated no fair-queue group-range 1/00 1/59 ! interface Dialer2 description ** Configuration cloned to all dialin users ip unnumbered Loopback1 encapsulation ppp ip tcp header-compression passive no keepalive dialer in-band dialer-group 1 peer default ip address pool AS5350-1-POOL no fair-queue no cdp enable ppp max-bad-auth 3 ppp authentication pap ppp ipcp dns XXX.XXX.XXX.XXX XXX.XXX.XXX.XXX ppp multilink ! router ospf 7631 router-id XXX.XXX.XXX.XXX log-adjacency-changes area 0 authentication redistribute connected subnets redistribute static subnets network XXX.XXX.XXX.XXX 0.0.0.255 area 0 ! ip local pool AS5350-1-POOL XXX.XXX.XXX.1 XXX.XXX.XXX.60 ip classless ip route 0.0.0.0 0.0.0.0 XXX.XXX.XXX.XXX no ip http server ip ospf name-lookup ! ip radius source-interface FastEthernet0/0 logging XXX.XXX.XXX.XXX access-list 100 permit ip any any ! dialer dnis group DNIS-ALL-BUT-DOV number 52731600 ! dialer dnis group DNIS-DOV number 52731601 dialer-list 1 protocol ip permit ! radius-server host XXX.XXX.XXX.XXX auth-port 1645 acct-port 1646 non-standard radius-server host XXX.XXX.XXX.XXX auth-port 1645 acct-port 1646 non-standard radius-server retransmit 3 radius-server key XXXXXXXXXXXX radius-server vsa send accounting ! voice-port 3/0:D ! voice-port 3/1:D ! line con 0 location ** CONSOLE CABLE exec-timeout 0 0 password 7 XXXXXXXXXXXX logging synchronous login authentication LINE_PASSWD transport input none line aux 0 logging synchronous line vty 0 4 exec-timeout 180 0 login authentication STORE_LOCAL line 1/00 1/59 no flush-at-activation autoselect ppp modem Dialin autocommand ppp transport input all ! scheduler allocate 10000 400 ntp clock-period 17179821 ntp source FastEthernet0/0 ntp server XXX.XXX.XXX.XXX end |
This page discusses setting up this configuration on a 30 line PRI, but the same technique is also applicable on a 24 line T1
Cisco have published a doc based on the information I have presented here. You can find it at http://www.cisco.com/warp/public/471/dov-rpm.html
The above config is based on IOS 12.1. We later upgraded to IOS 12.2, and the updated configuration is available here
Please let me know if you found this page of use :-)
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Page last edited :
21-Nov-2007
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