AD HOK conference doesnt work

[nicanor00]

Hi

I have cucm 12

AD conference doenst work

For internal call 

User A 410 call user B 411, then press conference, user B moove on hold normaly

User A 410 call user C 412 then press buton conference and the call hangup for the 3 user

For PSTN call (throught SIP trunk)

User A 410 call user B cell number 215xxxxx1 then press conference, user B moove on hold normaly

User A 410 call user C cell number 215xxxxx2  then press buton conference and the call hangup for user A 410

Only User B and user C remain in the conference throught PSTN network

Please help

[Jaime Valencia]

What troubleshooting have you done?

Have you already checked the basics?

and FYI, it's ad-hoc

[nicanor00]

The region are the same on all phone

But before it hapen, I made change on Audio Codec Preference List Configuration oh the region

This change was mandatory for the trunk configuration

I change the order of these 4 codec, the other codec other doenst change

Befor, it was

G.711 U-Law 64K
G.711 A-Law 64K
G.711 U-Law 56K
G.711 A-Law 56K

After the change, now it is

G.711 A-Law 64K
G.711 U-Law 64K
G.711 A-Law 56K
G.711 U-Law 56K

Please advise

[nicanor00]

The region are the same on all phone

But before it hapen, I made change on Audio Codec Preference List Configuration of the region

This change was mandatory for the trunk configuration

I change the order of these 4 codec, the other codec other doenst change

Befor, it was

G.711 U-Law 64K
G.711 A-Law 64K
G.711 U-Law 56K
G.711 A-Law 56K

After the change, now it is

G.711 A-Law 64K
G.711 U-Law 64K
G.711 A-Law 56K
G.711 U-Law 56K

Should I change something please help

[Jaime Valencia]

What do you use as CFB?

And, if you revert the codec preference list, does it work?

[Rajan · Accepted solution]

Have you checked the region settings on those 3 phones and whether the conference call involve codec changes ?

HTH
Rajan
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