i have tested many carriers for spain mobile ,voicetrading,voippro, quality is not good for retail or callcenter
but now i am working with Peoplecall.com they are not using g711 but with g729 it s working very good , they have another routes Africa but i dont work this market , i recommend this carrier for spain you can ask them in
[email protected] now i am looking for a cheap provider for spain ngn 34 902 , if you have any route rate 0.06 - 0.07 usd , send me a private message , 20000 minutes day
regards