CUCM. Call quality between regions

[berik_m]

Hello,

the problem is that if I assign the Default region to HQ phones and Region 1 to remote site phone, then
- man on the remote site hears well
- sound on the HQ site is bad (some words disappear, stutter and it's not clear what the other person is saying)

If I swap the regions (for the HQ phones - Default, for the remote - Region 1), then
- both sites hear each other well

What could be the reason?

[babak doraniarab]

it's about your configurartion on region side... 

when you go to server-> region -> you create 2 region .. you have to make sure about the max bandwithd when communicate with regi 1 to reg 1 ... and regi 1 to reg 2 

you can force the cucm to use g729

I had this problem before .. 

it will be ok ... 

[Chris Deren]

What codecs are defined between the regions?

How is your QoS configured between the sites? Do you have enough bandwidth in priority queue to support these calls?

[babak doraniarab]

we have a good bandwithd but if you are on wan .you have to use g729 codec

g729 use 8 kbit but alaw and ulaw (default) use 64 kbit

change your codec

[Chris Deren]

Incorrect, both u and a-law variants use the same bandwidth.

Are you saying when you change it to G711 things work better or when using G729 things are better? 

[babak doraniarab]

dude I know ulaw and alaw are the same in bandwithd
g729 is better than g711in wan communication

[Chris Deren]

I simply responded to your following statement:

"g729 use 8 kbit but alaw and ulaw (default) use 64 kbit"