Voip over DialUp Line

anjum87
Joined: Thu 30 of Sep, 2010

Voip over DialUp Line

Posted:Mon 04 of Oct, 2010 (05:03 UTC)
I want to connect Softphones Using Modem to an asterisk server. i.e asterisk server is connected to modem and softphone too connected to modem. I have some problems regarding quality of voice there is too much delay in voice I am using SPEXX with 60ms padding can any any suggest me good tips for better voice quality and can tell me
1. How to reduce RTP Payload Size
2. Is there any software based solution available for Header Compression
3. Can I intergrate my own codecs in asterisk

Thanks in advance for help