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New Member

T.38 NSE switchover issue

Good day!

I have issue with t38 nse based switchover - no switchover occurs with event 202

topology:

telco----pri-----ISRG2(MGCP)-----cucm------vg224(SCCP)----sg3fax(no ecm,forced 9600baud)

mgcp cfg:

no mgcp fax t38 inh

no mgcp fax t38 ecm

mgcp fax t38 nsf 000000

mgcp fax t38 gateway force

MODEMPASS disabled.

vg224 cfg:

voice service voip

fax protocol t38 nse force version 0 ls-redundancy 0 hs-redundancy 0 fallback none

debug info from vg224:

  18:11:51.508  :          s=DSP d=VoIP payload 0x64 ssrc 0x1DF0 sequence 0x15FF timestamp 0x4B8672E7

  18:11:51.508  :          Pt:100    Evt:200     Pkt:00 00 00  <Snd>>>

  18:11:51.520  :          s=DSP d=VoIP payload 0x64 ssrc 0x1DF0 sequence 0x1600 timestamp 0x4B8672E7

  18:11:51.520  :          Pt:100    Evt:200     Pkt:00 00 00  <Snd>>>

  18:11:51.536  :          s=VoIP d=DSP payload 0x63 ssrc 0x25AF82ED sequence 0xDD8 timestamp 0x44276827

  18:11:51.536  :  <<<Rcv> Pt:99     Evt:202     Pkt:00 00 00

  18:11:51.540  :          s=DSP d=VoIP payload 0x64 ssrc 0x1DF0 sequence 0x1602 timestamp 0x4B8672E7

  18:11:51.540  :          Pt:100    Evt:200     Pkt:00 00 00  <Snd>>>

  18:11:51.544  :          s=VoIP d=DSP payload 0x63 ssrc 0x25AF82ED sequence 0xDD9 timestamp 0x44276827

  18:11:51.544  :  <<<Rcv> Pt:99     Evt:202     Pkt:00 00 00

  18:11:51.564  :          s=VoIP d=DSP payload 0x63 ssrc 0x25AF82ED sequence 0xDDB timestamp 0x44276827

  18:11:51.564  :  <<<Rcv> Pt:99     Evt:202     Pkt:00 00 00

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New Member

T.38 NSE switchover issue

Issue solved by migrating port from sccp to mgcp.

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