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UC520 VOIP WAN Delay

Unanswered Question
Aug 21st, 2011
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We have a 7960 connected to a 871W which a has VPN connection back to the UC520. The call quality is good, but with a noticeable delay. Below is a show voice call output, but it is over my head:


#show voice call 0/2/0:23.10

0/2/0:23 10

      vtsp level 0 state = S_CONNECT

callid 0x801A B10 state S_TSP_CONNECT clld 4981469 cllg 9133226555

EMB-CME#        ***DSP VOICE TX STATISTICS***

Tx Vox/Fax Pkts: 4478, Tx Sig Pkts: 0, Tx Comfort Pkts: 0

Tx Dur(ms): 89570, Tx Vox Dur(ms): 89570, Tx Fax Dur(ms): 0

        ***DSP VOICE RX STATISTICS***

Rx Vox/Fax Pkts: 4469, Rx Signal Pkts: 0, Rx Comfort Pkts: 0

Rx Dur(ms): 89370, Rx Vox Dur(ms): 89160, Rx Fax Dur(ms): 0

Rx Non-seq Pkts: 0, Rx Bad Hdr Pkts: 0

Rx Early Pkts: 1, Rx Late Pkts: 10

        ***DSP VOICE VP_DELAY STATISTICS***

Clk Offset(ms): -1424178832, Rx Delay Est(ms): 60

Rx Delay Lo Water Mark(ms): 60, Rx Delay Hi Water Mark(ms): 220

        ***DSP VOICE VP_ERROR STATISTICS***

Predict Conceal(ms): 350, Interpolate Conceal(ms): 0

Silence Conceal(ms): 20, Retroact Mem Update(ms): 2

Buf Overflow Discard(ms): 0, Talkspurt Endpoint Detect Err: 2

Early Packet Dur (ms): 10, Clock Drifting Adjusted (ms): 0

Late Packet Discard (ms): 180, Silence Discard (ms): 360

JB Size Decrease (ms): 360, JB Size Increase (ms): 350

        ***DSP LEVELS***

TDM Bus Levels(dBm0): Rx -62.5 from PBX/Phone, Tx -53.5 to PBX/Phone

TDM ACOM Levels(dBm0): +22.0, TDM ERL Level(dBm0): +22.0

TDM Bgd Levels(dBm0): -72.1, with activity being silence

        ***DSP VOICE ERROR STATISTICS***

Rx Pkt Drops(Invalid Header): 0, Tx Pkt Drops(HPI SAM Overflow): 0

#show voice call 0/2/0:23.10

0/2/0:23 10

      vtsp level 0 state = S_CONNECT

callid 0x801A B10 state S_TSP_CONNECT clld 4981469 cllg 9133226555

EMB-CME#        ***DSP VOICE TX STATISTICS***

Tx Vox/Fax Pkts: 4478, Tx Sig Pkts: 0, Tx Comfort Pkts: 0

Tx Dur(ms): 89570, Tx Vox Dur(ms): 89570, Tx Fax Dur(ms): 0

        ***DSP VOICE RX STATISTICS***

Rx Vox/Fax Pkts: 4469, Rx Signal Pkts: 0, Rx Comfort Pkts: 0

Rx Dur(ms): 89370, Rx Vox Dur(ms): 89160, Rx Fax Dur(ms): 0

Rx Non-seq Pkts: 0, Rx Bad Hdr Pkts: 0

Rx Early Pkts: 1, Rx Late Pkts: 10

        ***DSP VOICE VP_DELAY STATISTICS***

Clk Offset(ms): -1424178832, Rx Delay Est(ms): 60

Rx Delay Lo Water Mark(ms): 60, Rx Delay Hi Water Mark(ms): 220

        ***DSP VOICE VP_ERROR STATISTICS***

Predict Conceal(ms): 350, Interpolate Conceal(ms): 0

Silence Conceal(ms): 20, Retroact Mem Update(ms): 2

Buf Overflow Discard(ms): 0, Talkspurt Endpoint Detect Err: 2

Early Packet Dur (ms): 10, Clock Drifting Adjusted (ms): 0

Late Packet Discard (ms): 180, Silence Discard (ms): 360

JB Size Decrease (ms): 360, JB Size Increase (ms): 350

        ***DSP LEVELS***

TDM Bus Levels(dBm0): Rx -62.5 from PBX/Phone, Tx -53.5 to PBX/Phone

TDM ACOM Levels(dBm0): +22.0, TDM ERL Level(dBm0): +22.0

TDM Bgd Levels(dBm0): -72.1, with activity being silence

        ***DSP VOICE ERROR STATISTICS***

Rx Pkt Drops(Invalid Header): 0, Tx Pkt Drops(HPI SAM Overflow): 0



 

The delay seems to be the same with both g729r8 and g711ulaw. We also have a SPA525-G2 connected over SSL VPN and it is experiencing the same delay.


Let me know what other information would be helpful. There is no noticeable delay with the onsite phones. The office Internet connection is a T1, PRI and the remote phones are cable (2 different ISPs).


Thanks for any thoughts or ideas.

Jeremy

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