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Conferencing under G729

Hello all,

I have a situation here, with a CUCM 6.0.1, with the following simptoms:

1) Conference with all stations configured (under the same region) to use G711: conferencing is OK;

2) Conference with all stations configured (under the same region) to use G729: conferencing is not available.

As far as I can do conferences with G711, why can't I do conferences with G729? I'm not mixing the codecs, as I'm using either G711 or G729, therefore, i don't think Transcoding is necessary. Should transcoding be configured as well?

Thanks,
Karl

1 Accepted Solution

Accepted Solutions

Hi Karl,

The following doc should help you out:  http://www.cisco.com/en/US/docs/ios/12_3/vvf_c/interop/intcnf2.html

HTH,

Chris

Please rate helpful posts

View solution in original post

15 Replies 15

clileikis
Rising star
Rising star

Hi Karl,

Software conference bridges only support G711.  You'll need either hardware conference bridges or a hardware transcoder and a software conference bridge to use G729.

HTH,

Chris

Hey Chris,

I think I've read this in some of the thousand documents I've read. Anyway, thanks for repplying!

Do you have any reference guide for hardware bridge? I've a router here with DSP resources avaiable (it's my voice gateway as well). Could you help me with that?

Hi Karl,

The following doc should help you out:  http://www.cisco.com/en/US/docs/ios/12_3/vvf_c/interop/intcnf2.html

HTH,

Chris

Please rate helpful posts

Thanks!

Hey Chris,

I create a DSPFarm in the voice gateway and create also the Conference Bridge in the CUCM 6.

The ConfBridge is registered at the CUCM, as I can see on both - router and CUCM.

But I still can't make conference. Do you have any tips? Attached is the router config and a print screen from CUCM.

Thanks!

============================================================================

!

voice-card 0

no dspfarm

dsp services dspfarm

!

!

!

sccp local GigabitEthernet0/0.20

sccp ccm 172.20.1.102 identifier 1 priority 1

sccp

!

sccp ccm group 1

description *** config para conferencia ***

bind interface GigabitEthernet0/0.20

associate ccm 1 priority 1

associate profile 6 register CFB0013C41ABA80

!

dspfarm profile 6 conference

codec g711ulaw

codec g711alaw

codec g729ar8

codec g729abr8

codec g729r8

codec g729br8

maximum sessions 3

associate application SCCP

!

=========================================================

it7-rot-csc-04#sh sccp connections

Total number of active session(s) 0, and connection(s) 0

it7-rot-csc-04#sh sccp all

SCCP Admin State: UP

Gateway IP Address: 192.168.10.3, Port Number: 2000

IP Precedence: 5

User Masked Codec list: None

Call Manager: 172.20.1.102, Port Number: 2000

                Priority: 1, Version: 3.1, Identifier: 1

Conferencing Oper State: ACTIVE - Cause Code: NONE

Active Call Manager: 172.20.1.102, Port Number: 2000

TCP Link Status: CONNECTED, Profile Identifier: 6

Reported Max Streams: 24, Reported Max OOS Streams: 0

Supported Codec: g711ulaw, Maximum Packetization Period: 30

Supported Codec: g711alaw, Maximum Packetization Period: 30

Supported Codec: g729ar8, Maximum Packetization Period: 60

Supported Codec: g729abr8, Maximum Packetization Period: 60

Supported Codec: g729r8, Maximum Packetization Period: 60

Supported Codec: g729br8, Maximum Packetization Period: 60

Supported Codec: rfc2833 dtmf, Maximum Packetization Period: 30

SCCP Application Service(s) Statistics:

Profile Identifier: 6, Service Type: Conferencing

TCP packets rx 59, tx 63

Unsupported pkts rx 0, Unrecognized pkts rx 0

Register tx 2, successful 2, rejected 0, failed 0

KeepAlive tx 52, successful 52, failed 0

OpenReceiveChannel rx 0, successful 0, failed 0

CloseReceiveChannel rx 0, successful 0, failed 0

StartMediaTransmission rx 0, successful 0, failed 0

StopMediaTransmission rx 0, successful 0, failed 0

Reset rx 1, successful 0, failed 0

MediaStreamingFailure rx 0

MediaStreamingFailure tx 0

Switchover 0, Switchback 0

CCM Group Identifier: 1

Description: *** config para conferencia ***

Binded Interface: GigabitEthernet0/0.20, IP Address: 192.168.10.3

Associated CCM Id: 1, Priority in this CCM Group: 1

Associated Profile: 6, Registration Name: CFB0013C41ABA80

Registration Retries: 3, Registration Timeout: 10 sec

Keepalive Retries: 3, Keepalive Timeout: 30 sec

CCM Connect Retries: 3, CCM Connect Interval: 10 sec

Switchover Method: GRACEFUL, Switchback Method: GRACEFUL_GUARD

Switchback Interval: 10 sec, Switchback Timeout: 7200 sec

Signaling DSCP value: cs3, Audio DSCP value: ef

Total number of active session(s) 0, and connection(s) 0

Total number of active session(s) 0, and connection(s) 0

Total number of active session(s) 0, connection(s) 0, and callegs 0

SCCP Application Service(s) Statistics Summary:

Total Conferencing Sessions: 0, Connections: 0

Total Transcoding Sessions: 0, Connections: 0

Total MTP Sessions: 0, Connections: 0

Total ALG-Phone Sessions: 0, Connections: 0

Total BRI-Phone Sessions: 0, Connections: 0

Total SCCP Sessions: 0, Connections: 0

it7-rot-csc-04#

it7-rot-csc-04#

it7-rot-csc-04#

clileikis
Rising star
Rising star

Hi Karl,

Can you confirm that the hardware conference bridge is in the appropriate MRG and prioritized properly in the MRGL of the phones?

Chris

Sent from Cisco Technical Support iPhone App

Hi Chris,

I created new MRG and MRGL for this test, as I don't want to cause any problems to the whole company.

I set 3 IP SIP phones to the new Device Pool;

Device pool has the new Region and also the new MRGL configured;

MRGL has the new MRG configured.

Inside the MRG is the new confbridge configured (attached this last one print).

The SIP phone is a Linksys, with the CONF button. I'm doing the same process as for G711: Call established, conf button is pressed, 3rd participant number is dialed after the response, the conf button is pressed again. The call drops (the same situation on G711 makes a conference, instead of dropping the call).

What do you think? is transcoding or MTP necessary to be created too?

Thanks!

Hi Chris,

I realizes I created it wrong. It's a Cisco IOS Conference Bridge and not a Cisco Conference Bridge Hardware, as I did.

I deleted it and recreate a new Cisco IOS Conference Bridge. I'm not sure whether it should Cisco IOS Conference Bridge or the Cisco IOS Enhanced Conference Bridge. I have a 2821 router with PVDM2 installed on it.

Hi Karl,

For PVDM2's your looking for Cisco IOS Enhanced Conference Bridge.

HTH,

Chris

I've just did as you said. It looks registered at the CUCM.

Do you have any idea how could I troubleshoot it?

Thanks!
Karl

Hi Karl,

It could be a number of things, it looks like you're using locations based CAC in your conference bridge config, you may want to ensure you've configured that correctly with the appropriate amount of bandwidth between locations.  Also, try adding the following command under your voice-card 0:  dspfarm

HTH,

Chris

Hi Chris,

First of all, thanks for helping me.

I've just tried to create as you said, Cisco IOS Enhanced Conference Bridge, but CUCM show the registration status as REJECTED. If I create the conference in the wrong way, for example as Cisco IOS Conference Bridge, it simply registers.

Now I'm trying to find out why it's now registrating at CUCM. Device names on both router and CUCM are fine. Do you have any idea?