Cisco Support Community
Community Member

pots->voip setup problem on AS 5400: *modem* calls, not voice

I have a problem with dial peer definition on a PSTN Gateway AS5400 -- incoming voice calls process as *MODEM* rather than as *VOICE* calls.


dial-peer voice 5629912 voip

incoming called-number 5045629912

destination-pattern 5045629912

voice-class h323 1

session target ipv4:---.--.23.79

codec g711ulaw


The ipv4 address is to a 3600 with call manager express, (and registered 7940 IP Phones, working inter-office).

No match to dial peer occurs, yet I'm certain q.931 setup msg contains literal match in 'called party'.

show dialplan 5045629912

provides confirmation, indicating 'type = voice'.

Some system info:

IOS version


ISDN signaling on 1 connected PRI T1.

show spe results when active calls received: (identical sample q.931 setups msgs from softswitch nfas D diagnostic tool, all same called party number which matches dial peer)

show spe output:

2/03 0018-0023 ACTIVE 0 0 0 ____aa ____mm

2/04 0024-0029 ACTIVE 0 0 0 aa____ mm____

Any help with this greatly appreciated!

Cisco Employee

Re: pots->voip setup problem on AS 5400: *modem* calls, not voic

Please paste the full config of the AS5400. The information above does not tell us enough to give an opinion on the problem.

Community Member

Re: pots->voip setup problem on AS 5400: *modem* calls, not voic

You need to configure a dial-peer voice pots, with the incomming calling numbert you want to reach and the T1/E1 Port associated.

Community Member

Re: pots->voip setup problem on AS 5400: *modem* calls, not voic

Thanks for your reply. With lots of help, we eventually found out how to mix voice and dial-up acceptably.

The approach involved setting up resource-pool elements.

Group resource definitions contain range port statements; these can be referenced by profile customer definitions that also bind dialer dnis entries, thereby linking a range of ports with specific called party telephone numbers.

Lastly, an Async Group is created with port-range identical to the ports in the resource-pool group resource (data). The Async group has the necessary IOS configuration commands for correct setup of modem ports.

The net result is that when calls are received, the calling party number in the Q.931 setup message can be matched with a dnis group. If the dnis group matches the access number list for dial-up users, then the call will land in the range of ports configured for modem/data calls. If the called party number matches one of the dnis groups keyed to the voice resource entries, it will land on one of the ports that has (effectively) no special config, no authorization setup, etc., i.e., those ports considered 'voice' ports in the arrangement, and hopefully also matching a dial peer that can correctly set up call legs or route the call as otherwise required.

Here are selections from a working example (AS5400 configured as PSTN Gateway & Dial-up RAS)

NOTE: IT IS CRITICAL TO LEAVE SOME PORTS UN-ASSIGNED so that a group of ports is free for outbound pots calls... (if you want to do outbound calling). Otherwise no dsp resource errors result. In this example, 3/96 3/107 are not referenced by any aggregation entity.... These are free ports and end up in the default group. They can be selected for outbound calls (as this is a PSTN gateway config).

resource-pool enable


resource-pool group resource data

! description data ports are for dial up (modem calls).

range port 2/0 2/47


resource-pool group resource office

! ports for inbound voice (1 of 2)

range port 2/48 2/107


resource-pool group resource fax

range port 3/0 3/5


resource-pool group resource nulldnis

! additional ports for voice (2 of 2)

! utilized where 2 calls legs are needed and require 2 ports per call. Does not map to any dnis group.

range port 3/6 3/95


resource-pool profile customer data

limit base-size all

limit overflow-size 0

! bind group resource data, defined above

resource data speech

! bind dnis group data, defined below

dnis group data


resource-pool profile customer office

limit base-size all

limit overflow-size 0

resource office speech

dnis group office


resource-pool profile customer fax

limit base-size all

limit overflow-size 0

resource fax speech service fax

dnis group fax


resource-pool profile customer nulldnis

limit base-size all

limit overflow-size 0

resource nulldnis speech service nulldnis

dnis group default


resource-pool profile service fax


resource-pool profile service nulldnis


resource-pool profile service office

dialer dnis group data

! put ranges, or number commands here to specify

! called party numbers for dial-up access here.

! imaginary RAS 10K NNX with 'hole' for voice numbers between last 4 of 1000-1999

number 4004000xxx

number 4004002xxx

number 4004003xxx

! etc..


dialer dnis group office

range 4004001000 4004001998


dialer dnis group fax

number 4004001999

interface Group-Async1

bandwidth 56

ip unnumbered FastEthernet0/0

encapsulation ppp

no ip mroute-cache

timeout absolute 86400 0

dialer in-band

dialer idle-timeout 1800

dialer-group 1

async mode interactive

peer default ip address pool nas-ip-pool

no keepalive

ppp max-bad-auth 4

ppp authentication pap callin

ppp authorization chap

ppp multilink

ppp timeout retry 5

group-range 2/00 2/47


CreatePlease to create content