hi,Minessale thank for your aswer, I show my setting below: my previous setting in vars.xml is： <X-PRE-PROCESS cmd="set" data="global_codec_prefs=G7221@32000h,speex@8000h@20i,speex@16000h@20i,speex@32000h@20i,G7221@16000h,G722,PCMU,PCMA,iLBC@30i,GSM"/> then I change my setting as: <X-PRE-PROCESS cmd="set" data="global_codec_prefs=G7221@32000h,speex@8000h,speex@16000h,speex@32000h,G7221@16000h,G722,PCMU,PCMA,iLBC@30i,GSM"/> the problem still exist. the appearance is : the x-lite (8000h) calling side sound good, and the x-lite called side's voice quality is very poor. also I test many sip softphone, and get my analyze as: the media consultation in SDP(Session Discription Protocol) is not work correctly in speex@8000. can you get me more suggestion? or any one who have such experience in it ? thanks a lot ! --Forwarded Message Attachment-- From: anthony.minessale@gmail.com To: freeswitch-dev@lists.freeswitch.org Date: Tue, 22 Dec 2009 09:20:19 -0600 Subject: Re: [Freeswitch-dev] Help ！ How to adjust the freeswitch speex Codec 's parameter for my sip phone add speex@16000h instead of just speex to the codec list. 2009/12/21 sky tan <sky.side@hotmail.com> So I explain my question as: if I use x-lite softphone in speex codec(it must be narrowband), the vioce quality is pool . but when I use X-lite in speex wideband codec , the voice quality is very nice. I do try to change the parameter of default_codec_settings in mod_speex.c , but it seen don't affect anything. so who can tell me how to ajust the freeswitch side to fit the X-lite softphone in speex narrowband? best regards . your freeswitch' fan. -- Anthony Minessale II FreeSWITCH http://www.freeswitch.org/ ClueCon http://www.cluecon.com/ Twitter: http://twitter.com/FreeSWITCH_wire AIM: anthm MSN:anthony_minessale@hotmail.com GTALK/JABBER/PAYPAL:anthony.minessale@gmail.com IRC: irc.freenode.net #freeswitch FreeSWITCH Developer Conference sip:888@conference.freeswitch.org iax:guest@conference.freeswitch.org/888 googletalk:conf+888@conference.freeswitch.org pstn:+19193869900 _________________________________________________________________ Windows Live Hotmail: Your friends can get your Facebook updates, right from Hotmail®. http://www.microsoft.com/middleeast/windows/windowslive/see-it-in-action/soc...