488 Not Acceptable Media

[Ahmed Adeyemi]

Hello all,

I've been stuck troubleshooting a 488 Not Acceptable Media on my CUBE. The call goes from my CUCM to the Cube which is expecting to be in G.711 but its coming in as G.729. The carrier i'm sending out to is expecting a PCMU which is G.711 mulaw.

Initially, the call was working but I was getting a oneway audio. I decided to delete and re-add my IP Communicator and this started to happen.

When I place the call from my CIPC, it gives me a fast busy.

Please see the show run and debug for the call I placed.

[Ayodeji Okanlawon]

Hi Ahmed,

There are two things you need to do here If you want CUCM to send calls to CUBE using G711

1. Set the region between the sip trunk and your endpoint to use 64bit rate codec (with G711 as the preferred codec)

2. Your voice class codec applied to your dial-peer is 1 but the one you actually have on your gateway is shown below. Change your dial-peer to use voice class-codec 2

voice class codec 2
 codec preference 1 g711ulaw
 codec preference 2 g729r8

[Ahmed Adeyemi]

Hello Ayodeji,

       Thanks for your assistance on this.

On the CUCM, my region is set to as 64 kbps (G.722, G.711) which is associated to the devicepool and the phone That's why I am confused as to why the CUCM would send G.729

Also, in my GW config, I have

voice class codec 1
 codec preference 1 g711ulaw

Please, correct me if i'm wrong.

[Ayodeji Okanlawon]

I noticed that this call came with early-offer, this suggests that you may have checked "MTP required on the sip trunk" and the originating codec is G729..

To Know in detail what's going on we will need cucm traces..

What IP address is this?

c=IN IP4 192.168.7.129

[Ahmed Adeyemi]

That IP is the IP address to my CIPC. I am able to connect because I am VPN'd into the network. But even when I went to the site, the issue is still the same.

[Ayodeji Okanlawon · Accepted solution]

Can you send the cucm traces for a test call?

The link below shows how to do this

https://supportforums.cisco.com/document/126666/collecting-cucm-traces-cucm-862-tac-sr

[Ahmed Adeyemi]

Thanks. I'm having issues lunching RTMT that's why is taking a little longer.

[Chris Deren]

looks like the call is attempting to go as iLBC first, and there is no G711 capabilities in the early offer SDP messages.  What region is assigned to the phone and what region is assigned to the SIP trunk? What is the codec between them?

How is your "audio codec preference list" configured?

v=0
o=CiscoSystemsCCM-SIP 60 1 IN IP4 10.10.10.79
s=SIP Call
c=IN IP4 192.168.7.129
b=TIAS:64000
b=AS:64
t=0 0
m=audio 24578 RTP/AVP 116 18 101
a=rtpmap:116 iLBC/8000
a=ptime:20
a=maxptime:60
a=fmtp:116 mode=20
a=rtpmap:18 G729/8000
a=ptime:20
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15

[Ahmed Adeyemi]

Hello Chris,

       Both my phone and SIP trunk are assigned to the same device pool which is assigned to the region with 64 kbps (G.722, G.711) codec.

I only have one device pool in the CUCM which is what I am using for all my devices associated.

[Chris Deren]

How is your "audio codec preference list" configured?

Can you post the screen shot of the region?

Are you using device mobility by any chance?

[Ahmed Adeyemi]

This is the order I have them in. I am not using Device Mobility

AMR-WB (7k-24k)
AMR (5k-13k)
MP4A-LATM 128k
AAC-LD (MP4A Generic)
MP4A-LATM 64k
MP4A-LATM 56k
L16 256k
MP4A-LATM 48k
ISAC 32k
MP4A-LATM 32k
G.722 64k
G.722.1 32k
G.722 56k
G.722.1 24k
G.722 48k
MP4A-LATM 24k
G.711 U-Law 64k
G.711 A-Law 64k
G.711 U-Law 56k
G.711 A-Law 56k
ILBC 16k
G.728 16k
GSM Enhanced Full Rate 13k
GSM Full Rate 13k
G.729b 8k
G.729ab 8k
G.729 8k
G.729a 8k
GSM Half Rate 6k
G.723.1 7k

Region Information

Name

Region Relationships

Region	Audio Codec Preference List	Maximum Audio Bit Rate	Maximum Session Bit Rate for Video Calls
HATA_Core	Use System Default (Factory Default low loss)	64 kbps (G.722, G.711)	384
NOTE: Regions not displayed	Use System Default	Use System Default	Use System Default

Modify Relationship to other Regions

Regions	Audio Codec Preference List	Maximum Audio Bit Rate	Maximum Session Bit Rate for Video Calls
HATA_Core	Keep Current SettingUse System DefaultFactory Default lossyFactory Default low loss	Keep Current SettingUse System Default7 kbps (GSM-HR, G.723.1)8 kbps (G.729)13 kbps (GSM-FR, AMR)16 kbps (iLBC, G.728)24 kbps (AMR-WB)32 kbps (iSAC, G.722.1)64 kbps (G.722, G.711)128 kbps (AAC-LD[LATM])256 kbps (L16, AAC-LD)	Keep Current Setting Use System Default None

[Ayodeji Okanlawon]

What is your intra region setting set to? Is this set to use system default. Can you change this to G711. NB this is intra region not inter region..

[Ahmed Adeyemi]

Please, can you explain how I go about changing this? Here is the screen shot of my region

[Ayodeji Okanlawon]

It looks like the region is already set to G711..

But please double check because this behaviour is not normal

Go to cucm web admin, system>service parameters>select the server>select cucm service> search for Default Intraregion Max Audio Bit Rate

Confirm what it is set to

How about the logs? We would have solved this if we have cucm logs by now 

[Ahmed Adeyemi]

Here is the service Parameters