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It is Hard to say there is a problem but there are few points you should verify. <br><br>1. Codec (ulaw is good if you have enough bandwidth) <br>2. System CPU load <br>3. Bandwidth <br>4. PRI card ( Hardware echo cancellation or software )<br>5. Kernel option CONFIG_HZ=1000 (Worth have this option) <br>6. Finally Google your issue. <br><br><hr id="stopSpelling">Date: Tue, 12 Apr 2011 09:42:37 +0800<br>From: man.evolution@gmail.com<br>To: asterisk-users@lists.digium.com<br>Subject: [asterisk-users] Poor call quality – line drop, chopping sound, like robotic voice, Both party could not hear caller voice<br><br>One of our client facing this issue, we have try to solve it but we're
lack of asterisk knowledge. Anybody can help us? Isn't any problem with
asterisk configuration or the problem come from PRI E1 itself?<br><br>[Apr 11 15:32:48] VERBOSE[9231] chan_dahdi.c: -- Requested transfer capability: 0x00 - SPEECH<br>
[Apr 11 15:32:48] DEBUG[6888] channel.c: Avoiding initial deadlock for channel '0xb67f3d50'<br>
[Apr 11 15:32:48] VERBOSE[9231] app_dial.c: -- Called g0/0XXXXXXXXX<br>
[Apr 11 15:32:48] DEBUG[9231] channel.c: Set channel DAHDI/2-1 to read format ulaw<br>
[Apr 11 15:32:48] DEBUG[9231] channel.c: Set channel SIP/2130-000006fb to write format ulaw<br>
[Apr 11 15:32:48] DEBUG[9231] channel.c: Set channel SIP/2130-000006fb to read format alaw<br>
[Apr 11 15:32:48] DEBUG[2993] manager.c: Manager received command 'GetVar'<br>
[Apr 11 15:32:48] NOTICE[9231] rtp.c: Unknown RTP codec 126 received from '192.168.100.130'<br>
[Apr 11 15:32:48] DEBUG[2993] manager.c: Manager received command 'GetVar'<br>
[Apr 11 15:32:48] DEBUG[6914] chan_dahdi.c: Queuing frame from PRI_EVENT_PROCEEDING on channel 0/2 span 1<br>
[Apr 11 15:32:48] VERBOSE[9231] app_dial.c: -- DAHDI/2-1 is proceeding passing it to SIP/2130-000006fb<br>
[Apr 11 15:32:48] DEBUG[9231] rtp.c: Ooh, format changed from unknown to ulaw<br>
[Apr 11 15:32:48] DEBUG[9232] audiohook.c: Failed to get 160 samples from read factory 0xb7817dd0<br>
[Apr 11 15:32:48] DEBUG[9231] rtp.c: Created smoother: format: 4 ms: 20 len: 160<br>
[Apr 11 15:32:48] DEBUG[6915] chan_dahdi.c: Queuing frame from PRI_EVENT_PROGRESS on channel 0/4 span 2<br>
[Apr 11 15:32:48] VERBOSE[9226] app_dial.c: -- DAHDI/35-1 is making progress passing it to SIP/2052-000006fa<br>
[Apr 11 15:32:48] VERBOSE[9226] app_dial.c: -- DAHDI/35-1 is making progress passing it to SIP/2052-000006fa<br>
[Apr 11 15:32:48] DEBUG[6893] chan_sip.c: Allocating new SIP dialog for <a href="mailto:656de8c01fcfde12371cfaa41a6cc357@127.0.1.1">656de8c01fcfde12371cfaa41a6cc357@127.0.1.1</a> - OPTIONS (No RTP)<br>
[Apr 11 15:32:48] DEBUG[6893] chan_sip.c: Initializing initreq for method OPTIONS - callid <a href="mailto:0ca5e0f16cc3027a450c5ce920189bc5@192.168.100.238">0ca5e0f16cc3027a450c5ce920189bc5@192.168.100.238</a><br>
[Apr 11 15:32:48] DEBUG[6893] chan_sip.c: Stopping retransmission on '<a href="mailto:0ca5e0f16cc3027a450c5ce920189bc5@192.168.100.238">0ca5e0f16cc3027a450c5ce920189bc5@192.168.100.238</a>' of Request 102: Match Found<br>
[Apr 11 15:32:49] DEBUG[30773] rtp.c: Got RTCP report of 76 bytes<br>
[Apr 11 15:32:49] DEBUG[9169] rtp.c: Got RTCP report of 76 bytes<br>
[Apr 11 15:32:49] DEBUG[9198] rtp.c: Got RTCP report of 64 bytes<br>
[Apr 11 15:32:49] DEBUG[6893] chan_sip.c: Allocating new SIP dialog for <a href="mailto:43bdc76362a70a0f138c364455fa976d@127.0.1.1">43bdc76362a70a0f138c364455fa976d@127.0.1.1</a> - OPTIONS (No RTP)<br>
[Apr 11 15:32:49] DEBUG[6893] chan_sip.c: Initializing initreq for method OPTIONS - callid <a href="mailto:645d2453470d5e3f1b3300d36c1f336b@192.168.100.238">645d2453470d5e3f1b3300d36c1f336b@192.168.100.238</a><br>
[Apr 11 15:32:49] DEBUG[9189] rtp.c: Got RTCP report of 72 bytes<br>
[Apr 11 15:32:49] DEBUG[6893] chan_sip.c: Stopping retransmission on '<a href="mailto:645d2453470d5e3f1b3300d36c1f336b@192.168.100.238">645d2453470d5e3f1b3300d36c1f336b@192.168.100.238</a>' of Request 102: Match Found<br>
[Apr 11 15:32:49] DEBUG[9204] audiohook.c: Failed to get 160 samples from read factory 0x87b8ee8<br>
[Apr 11 15:32:49] DEBUG[9204] audiohook.c: Failed to get 160 samples from read factory 0x87b8ee8<br>
[Apr 11 15:32:49] DEBUG[9204] audiohook.c: Failed to get 160 samples from read factory 0x87b8ee8<br>
[Apr 11 15:32:49] DEBUG[9204] audiohook.c: Failed to get 160 samples from read factory 0x87b8ee8<br>
[Apr 11 15:32:49] DEBUG[9204] audiohook.c: Failed to get 160 samples from read factory 0x87b8ee8<br>
[Apr 11 15:32:49] DEBUG[9204] audiohook.c: Failed to get 160 samples from read factory 0x87b8ee8<br>
[Apr 11 15:32:49] DEBUG[9204] audiohook.c: Failed to get 160 samples from read factory 0x87b8ee8<br>
[Apr 11 15:32:49] DEBUG[9204] audiohook.c: Failed to get 160 samples from read factory 0x87b8ee8<br>
[Apr 11 15:32:49] DEBUG[9204] audiohook.c: Failed to get 160 samples from read factory 0x87b8ee8<br>
[Apr 11 15:32:49] DEBUG[9204] audiohook.c: Failed to get 160 samples from read factory 0x87b8ee8<br>
[Apr 11 15:32:49] DEBUG[6893] chan_sip.c: Allocating new SIP dialog for <a href="mailto:7c88de720bc203f659251e860637b998@127.0.1.1">7c88de720bc203f659251e860637b998@127.0.1.1</a> - OPTIONS (No RTP)<br>
[Apr 11 15:32:49] DEBUG[6893] chan_sip.c: Initializing initreq for method OPTIONS - callid <a href="mailto:6229d4b2428b548648da2f357bd0eea6@192.168.100.238">6229d4b2428b548648da2f357bd0eea6@192.168.100.238</a><br>
[Apr 11 15:32:49] DEBUG[6893] chan_sip.c: Allocating new SIP dialog for <a href="mailto:7b0e287c51dcf9bc26f76b0c46e6aa5a@127.0.1.1">7b0e287c51dcf9bc26f76b0c46e6aa5a@127.0.1.1</a> - OPTIONS (No RTP)<br>
[Apr 11 15:32:49] DEBUG[6893] chan_sip.c: Initializing initreq for method OPTIONS - callid <a href="mailto:49db5d9a0c803a873c1309244bbb034e@192.168.100.238">49db5d9a0c803a873c1309244bbb034e@192.168.100.238</a><br>
[Apr 11 15:32:49] DEBUG[6893] chan_sip.c: Allocating new SIP dialog for <a href="mailto:5e36015920aef5cd6bd842ba38143d86@127.0.1.1">5e36015920aef5cd6bd842ba38143d86@127.0.1.1</a> - OPTIONS (No RTP)<br>
[Apr 11 15:32:49] DEBUG[6893] chan_sip.c: Initializing initreq for method OPTIONS - callid <a href="mailto:556cc68055c9aa9a1806c3ba0b3d0a43@192.168.100.238">556cc68055c9aa9a1806c3ba0b3d0a43@192.168.100.238</a><br>
[Apr 11 15:32:49] DEBUG[9204] audiohook.c: Failed to get 160 samples from read factory 0x87b8ee8<br>
[Apr 11 15:32:49] DEBUG[6893] chan_sip.c: Stopping retransmission on '<a href="mailto:49db5d9a0c803a873c1309244bbb034e@192.168.100.238">49db5d9a0c803a873c1309244bbb034e@192.168.100.238</a>' of Request 102: Match Found<br>
[Apr 11 15:32:49] DEBUG[9204] audiohook.c: Failed to get 160 samples from read factory 0x87b8ee8<br>
[Apr 11 15:32:49] DEBUG[9204] audiohook.c: Failed to get 160 samples from read factory 0x87b8ee8<br>
[Apr 11 15:32:49] DEBUG[6893] chan_sip.c: Stopping retransmission on '<a href="mailto:556cc68055c9aa9a1806c3ba0b3d0a43@192.168.100.238">556cc68055c9aa9a1806c3ba0b3d0a43@192.168.100.238</a>' of Request 102: Match Found<br>
[Apr 11 15:32:49] DEBUG[6893] chan_sip.c: Stopping retransmission on '<a href="mailto:6229d4b2428b548648da2f357bd0eea6@192.168.100.238">6229d4b2428b548648da2f357bd0eea6@192.168.100.238</a>' of Request 102: Match Found<br>
[Apr 11 15:32:49] DEBUG[9095] rtp.c: Got RTCP report of 72 bytes<br>
[Apr 11 15:32:49] DEBUG[9204] audiohook.c: Failed to get 160 samples from read factory 0x87b8ee8<br>
[Apr 11 15:32:49] DEBUG[9204] audiohook.c: Failed to get 160 samples from read factory 0x87b8ee8<br>
[Apr 11 15:32:49] DEBUG[9204] audiohook.c: Failed to get 160 samples from read factory 0x87b8ee8<br>
[Apr 11 15:32:49] DEBUG[9204] audiohook.c: Failed to get 160 samples from read factory 0x87b8ee8<br>
[Apr 11 15:32:49] DEBUG[9204] audiohook.c: Failed to get 160 samples from read factory 0x87b8ee8<br>
[Apr 11 15:32:49] DEBUG[9204] audiohook.c: Failed to get 160 samples from read factory 0x87b8ee8<br>
[Apr 11 15:32:49] DEBUG[6893] chan_sip.c: Allocating new SIP dialog for <a href="mailto:405603ee4d0a129860728dbc01b42904@127.0.1.1">405603ee4d0a129860728dbc01b42904@127.0.1.1</a> - OPTIONS (No RTP)<br>
[Apr 11 15:32:49] DEBUG[6893] chan_sip.c: Initializing initreq for method OPTIONS - callid <a href="mailto:2e8673db64cac2a0564cc1c81819aed3@192.168.100.238">2e8673db64cac2a0564cc1c81819aed3@192.168.100.238</a><br>
[Apr 11 15:32:49] DEBUG[9204] audiohook.c: Failed to get 160 samples from read factory 0x87b8ee8<br>
[Apr 11 15:32:49] DEBUG[6893] chan_sip.c: Stopping retransmission on '<a href="mailto:2e8673db64cac2a0564cc1c81819aed3@192.168.100.238">2e8673db64cac2a0564cc1c81819aed3@192.168.100.238</a>' of Request 102: Match Found<br>
[Apr 11 15:32:49] DEBUG[9204] audiohook.c: Failed to get 160 samples from read factory 0x87b8ee8<br>
[Apr 11 15:32:49] DEBUG[9203] rtp.c: Got RTCP report of 60 bytes<br>
[Apr 11 15:32:49] DEBUG[9179] rtp.c: Got RTCP report of 72 bytes<br>
[Apr 11 15:32:49] DEBUG[9204] audiohook.c: Failed to get 160 samples from read factory 0x87b8ee8<br>
[Apr 11 15:32:49] DEBUG[7753] rtp.c: Got RTCP report of 72 bytes<br>
[Apr 11 15:32:49] DEBUG[9204] audiohook.c: Failed to get 160 samples from read factory 0x87b8ee8<br>
[Apr 11 15:32:49] DEBUG[9204] audiohook.c: Failed to get 160 samples from read factory 0x87b8ee8<br>
[Apr 11 15:32:49] DEBUG[9204] audiohook.c: Failed to get 160 samples from read factory 0x87b8ee8<br>
[Apr 11 15:32:49] DEBUG[9204] audiohook.c: Failed to get 160 samples from read factory 0x87b8ee8<br>
[Apr 11 15:32:49] DEBUG[9204] audiohook.c: Failed to get 160 samples from read factory 0x87b8ee8<br>
[Apr 11 15:32:49] DEBUG[9204] audiohook.c: Failed to get 160 samples from read factory 0x87b8ee8<br>
[Apr 11 15:32:49] DEBUG[9204] audiohook.c: Failed to get 160 samples from read factory 0x87b8ee8<br>
[Apr 11 15:32:49] DEBUG[1865] rtp.c: Got RTCP report of 72 bytes<br>
[Apr 11 15:32:49] DEBUG[9204] audiohook.c: Failed to get 160 samples from read factory 0x87b8ee8<br>
[Apr 11 15:32:49] DEBUG[9204] audiohook.c: Failed to get 160 samples from read factory 0x87b8ee8<br>
[Apr 11 15:32:49] DEBUG[9204] audiohook.c: Failed to get 160 samples from read factory 0x87b8ee8<br>
[Apr 11 15:32:49] DEBUG[9204] audiohook.c: Failed to get 160 samples from read factory 0x87b8ee8<br>
[Apr 11 15:32:49] DEBUG[9204] audiohook.c: Failed to get 160 samples from read factory 0x87b8ee8<br>
[Apr 11 15:32:49] DEBUG[9155] rtp.c: Got RTCP report of 76 bytes<br>
[Apr 11 15:32:50] DEBUG[9204] audiohook.c: Failed to get 160 samples from read factory 0x87b8ee8<br>
[Apr 11 15:32:50] DEBUG[9204] audiohook.c: Failed to get 160 samples from read factory 0x87b8ee8<br>
[Apr 11 15:32:50] DEBUG[9204] audiohook.c: Failed to get 160 samples from read factory 0x87b8ee8<br>
[Apr 11 15:32:50] DEBUG[9204] audiohook.c: Failed to get 160 samples from read factory 0x87b8ee8<br>
[Apr 11 15:32:50] DEBUG[9204] audiohook.c: Failed to get 160 samples from read factory 0x87b8ee8<br>
[Apr 11 15:32:50] DEBUG[9204] audiohook.c: Failed to get 160 samples from read factory 0x87b8ee8<br>
[Apr 11 15:32:50] DEBUG[9204] audiohook.c: Failed to get 160 samples from read factory 0x87b8ee8<br>
[Apr 11 15:32:50] DEBUG[9204] audiohook.c: Failed to get 160 samples from read factory 0x87b8ee8<br>
[Apr 11 15:32:50] DEBUG[9106] audiohook.c: Failed to get 160 samples from read factory 0xb4a38510<br>
[Apr 11 15:32:50] DEBUG[9204] audiohook.c: Failed to get 160 samples from read factory 0x87b8ee8<br>
[Apr 11 15:32:50] DEBUG[9204] audiohook.c: Failed to get 160 samples from read factory 0x87b8ee8<br>
[Apr 11 15:32:50] DEBUG[9204] audiohook.c: Failed to get 160 samples from read factory 0x87b8ee8<br>
[Apr 11 15:32:50] DEBUG[9204] audiohook.c: Failed to get 160 samples from read factory 0x87b8ee8<br>
[Apr 11 15:32:50] DEBUG[9203] rtp.c: Channel '<unspecified>' has no RTP, not doing anything<br>
[Apr 11 15:32:50] DEBUG[9203] channel.c: Hanging up channel 'DAHDI/69-1'<br>
[Apr 11 15:32:50] DEBUG[9203] chan_dahdi.c: dahdi_hangup(DAHDI/69-1)<br>
[Apr 11 15:32:50] DEBUG[9203] chan_dahdi.c: Set option AUDIO MODE, value: ON(1) on DAHDI/69-1<br>
[Apr 11 15:32:50] DEBUG[9203] chan_dahdi.c: Hangup: channel: 69 index = 0, normal = 87, callwait = -1, thirdcall = -1<br>
[Apr 11 15:32:50] DEBUG[9203] chan_dahdi.c: Not yet hungup... Calling hangup once with icause, and clearing call<br>
[Apr 11 15:32:50] DEBUG[9203] chan_dahdi.c: Set option TDD MODE, value: OFF(0) on DAHDI/69-1<br>
[Apr 11 15:32:50] DEBUG[9203] chan_dahdi.c: Updated conferencing on 69, with 0 conference users<br>
[Apr 11 15:32:50] DEBUG[9203] chan_dahdi.c: Set option AUDIO MODE, value: OFF(0) on DAHDI/69-1<br>
[Apr 11 15:32:50] VERBOSE[9203] chan_dahdi.c: -- Hungup 'DAHDI/69-1'<br>
[Apr 11 15:32:50] DEBUG[9203] app_dial.c: Exiting with DIALSTATUS=CANCEL.<br>
<br>
[Apr 11 15:36:10] DEBUG[9337] audiohook.c: Failed to get 160 samples from read factory 0xb4243240<br>
[Apr 11 15:36:10] DEBUG[9717] audiohook.c: Failed to get 160 samples from read factory 0x8872ac0<br>
[Apr 11 15:36:10] DEBUG[9443] audiohook.c: Failed to get 160 samples from read factory 0xb4a4ad00<br>
[Apr 11 15:36:10] DEBUG[7754] audiohook.c: Failed to get 160 samples from read factory 0xb780a800<br>
[Apr 11 15:36:10] DEBUG[9389] audiohook.c: Failed to get 160 samples from read factory 0x879f710<br>
[Apr 11 15:36:10] DEBUG[9170] audiohook.c: Failed to get 160 samples from read factory 0xb5cbb568<br>
[Apr 11 15:36:10] DEBUG[2993] manager.c: Manager received command 'GetVar'<br>
[Apr 11 15:36:10] DEBUG[6893] chan_sip.c: (Provisional) Stopping retransmission (but retaining packet) on '<a href="mailto:73e178f5465d0ff817ca38f73a1e3f1a@192.168.100.238">73e178f5465d0ff817ca38f73a1e3f1a@192.168.100.238</a>' Request 102: Found<br>
[Apr 11 15:36:10] DEBUG[6889] db.c: Unable to find key 'DND2105' in family 'CustomDevstate'<br>
[Apr 11 15:36:10] DEBUG[9707] audiohook.c: Flushing audiohook 0x8959d48 so it remains in sync<br>
[Apr 11 15:36:10] DEBUG[9335] rtp.c: Got RTCP report of 72 bytes<br>
[Apr 11 15:36:10] DEBUG[9165] rtp.c: Got RTCP report of 76 bytes<br>
[Apr 11 15:36:10] DEBUG[9442] chan_dahdi.c: Write returned -1 (Resource temporarily unavailable) on channel 35<br>
[Apr 11 15:36:10] DEBUG[8518] chan_dahdi.c: Write returned -1 (Resource temporarily unavailable) on channel 63<br>
[Apr 11 15:36:10] DEBUG[9169] chan_dahdi.c: Write returned -1 (Resource temporarily unavailable) on channel 7<br>
[Apr 11 15:36:10] DEBUG[9316] chan_dahdi.c: Write returned -1 (Resource temporarily unavailable) on channel 71<br>
[Apr 11 15:36:10] DEBUG[9388] chan_dahdi.c: Write returned -1 (Resource temporarily unavailable) on channel 6<br>
[Apr 11 15:36:10] DEBUG[9723] chan_dahdi.c: Write returned -1 (Resource temporarily unavailable) on channel 75<br>
[Apr 11 15:36:10] DEBUG[9707] chan_dahdi.c: Write returned -1 (Resource temporarily unavailable) on channel 9<br>
[Apr 11 15:36:10] DEBUG[9336] chan_dahdi.c: Write returned -1 (Resource temporarily unavailable) on channel 67<br>
[Apr 11 15:36:10] DEBUG[7799] chan_dahdi.c: Write returned -1 (Resource temporarily unavailable) on channel 36<br>
<br>
[Apr 11 15:36:14] VERBOSE[10431] chan_dahdi.c: -- Requested transfer capability: 0x00 - SPEECH<br>
[Apr 11 15:36:14] DEBUG[6888] channel.c: Avoiding initial deadlock for channel '0xb5ce6220'<br>
[Apr 11 15:36:14] VERBOSE[10431] app_dial.c: -- Called g2/0138277798<br>
[Apr 11 15:36:14] DEBUG[10431] channel.c: Set channel DAHDI/72-1 to read format ulaw<br>
[Apr 11 15:36:14] DEBUG[10431] channel.c: Set channel SIP/2106-00000761 to write format ulaw<br>
[Apr 11 15:36:14] DEBUG[10431] channel.c: Set channel SIP/2106-00000761 to read format alaw<br>
[Apr 11 15:36:14] DEBUG[10431] chan_dahdi.c: Dropping frame since I'm still dialing on DAHDI/72-1...<br>
[Apr 11 15:36:14] DEBUG[10432] audiohook.c: Failed to get 160 samples from write factory 0xb5c63440<br>
[Apr 11 15:36:14] DEBUG[9237] audiohook.c: Failed to get 160 samples from read factory 0x8876a00<br>
[Apr 11 15:36:14] DEBUG[9317] audiohook.c: Failed to get 160 samples from read factory 0xb5cd1e18 <br><br><br>Thanks & Regards,<br>Aiman Rosli<br>
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