We are using Cisco callmanager 5 in the UK with an MGCP gateway connecting to the PSTN via an E1 PRI.
The problem is, whenever we make a call and check the codec being used, it says it is using G711u i.e. U-Law. As far as I understand it, the PSTN in the UK uses A-law. How can we configure callmanager to use A-law between the gateway and the IP Phones? As it stands it works, it just bugs me why we have to use u-law.