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New Member

CISCO 3825 G729

I have a cisco 3825 that I need the sip call leg entering the switch to be able to offer g729 curently it seems all calls are in G711U.  I am not abke to assign "

voice-class codec 1' to the

dial-peer voice 100 pots

any ideas?

Cisco Employee

CISCO 3825 G729

hello fernando

what is the call flow topology?


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Br, Nadeem Please rate all useful post.
New Member

CISCO 3825 G729

Thank you for the reply..

call comes in as SIP from GIGE0/0 hits the dialer-peer voice 100 pots that points to a trunk group consisting of the

interface Serial0/0/0:23

no ip address

encapsulation hdlc

isdn switch-type primary-ni

isdn incoming-voice voice

trunk-group ALL

no cdp enable

then out the PRI

CISCO 3825 G729

Hi Fernando,

Codec class is not supported on POTS dial-peer , its only for VOIP DP. There is an option you can put it under voice port , which further points to POTS DP.

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New Member

CISCO 3825 G729

Thank you but did not see anything about this in the voice-port     Do you know why this router does not have the option for

voice service voip

ip address trusted list


It seems I have no way to limit who can send calls to this device..  I attempted access-list but not sure if correct since if I send calls to it from my signaling server and dont include all customer ips as well it will block the rtp traffci since it is coming from a non-permited IP..

Any ideas?

CISCO 3825 G729


There is an option" codec complexity" under voice port but that didn't give intended result which you want.

Can you check by assigning subnet mask next to IP address under ip address trusted list. Like..

voice service voip
 ip address trusted list

And also do let us know IOS version of your router.

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New Member

Re: CISCO 3825 G729

This is what i am getting:

Router(config)#voice service voip

Router(conf-voi-serv)# ip address trusted list


% Invalid input detected at '^' marker.

Here is the info you requested

System image file is "flash:c3825-adventerprisek9_ivs-mz.150-1.M10.bin"

Last reload type: Normal Reload

Cisco 3825 (revision 1.2) with 487423K/36864K bytes of memory.

Processor board ID FTX1224A4WM

2 Gigabit Ethernet interfaces

120 Serial interfaces

5 Channelized T1/PRI ports

1 Virtual Private Network (VPN) Module

DRAM configuration is 64 bits wide with parity enabled.

479K bytes of NVRAM.

250880K bytes of ATA System CompactFlash (Read/Write)

License Info:

License UDI:


Device#            PID                              SN


*0              CISCO3825             FTX1224A4WM    

Re: CISCO 3825 G729

Toll fraud prevention was introduced in release 15.1(2).
I suggest you to upgrade the IOS to the latest release available for 3825 which is 15.1(4)M7
You can negotiate g729 on voip dialpeers pointing to peers supporting that codec.




Sent from Cisco Technical Support iPhone App

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New Member

Re: CISCO 3825 G729

Thanks Carlo you wouldnt have the bin file would you I dont have a access to download it..