E1 R2 not negotiate the codec G711

[cristian.munoz]

Hi Guys

I have a issue with a E1 R2. The calls from and to PSTN using the E1 R2 and not negotiate the codec G711,only use the codec g729.
I´ve change the class code using G711a and G711u only, but the call get a congestion. I have a E1 PRI in the same GW and the calls using G711, no problem.

This is the configuration:

controller E1 0/0/0
framing NO-CRC4
pri-group timeslots 1-31

controller E1 0/0/1
framing NO-CRC4
ds0-group 0 timeslots 1-15,17-31 type r2-digital r2-compelled

voice class codec 1
codec preference 1 g711ulaw
codec preference 2 g711alaw
codec preference 3 g729r8

dial-peer voice 8600 voip

destination-pattern 86..

session target ipv4:SUB1

voice-class codec 1 

voice-class h323 1

dtmf-relay h245-alphanumeric

no vad

dial-peer voice 8601 voip
preference 2
destination-pattern 86..
session target ipv4:SUB1
voice-class codec 1 
voice-class h323 1
dtmf-relay h245-alphanumeric
no vad

dial-peer voice 100 pots
destination-pattern 9T
incoming called-number .
fax rate disable
direct-inward-dial
port 0/0/1:0

Any idea?

TIA
Cristian

[acampbell]

Christian,

On the CUCM admin pages.

Check the region that your gateway is in supports G711.

Also check the location for bandwidth, is there enough BW set to

allow G711 ,

Roughly

24K per G729 call

80K per G711 call.

Regards,
Alex.
Please rate useful posts.

[cristian.munoz]

Thank you Alex, but the GW are in the same region that the IP Phones (G722-G711) and when the call use the E1 PRI negotiate using the class codec configured in the GW.

There are a command necessary for to do fixed to use G711 the E1 R2?

TIA

Cristian

[acampbell]

Christian,

Can you look at the gateway config page on your CUCM.

Have you enable FastStart for inbound and outbound ?

That may be stopping the negotiation as you select a codec to use.

Try disabling FastStart if it is set

Regards,
Alex.
Please rate useful posts.

[cristian.munoz]

Dear Alex

Enable Inbound FastStart and Enable Outbound FastStart are disable.

TIA
Cristian

[acampbell]

Christian,

debug cch323 h245

and make a test call

Regards,
Alex.
Please rate useful posts.