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grandstream GRP2601P double RBT

grandstream GRP2601P double RBT

grandstream GRP2601P double RBT

Hi friends,
I installe matrix comsec IPPBX with grandstream GRP2601P opensip endpoint,When I calls another SIP extension the RBT is of dual frequency means I can hear two different ringing tones.But my fault finding is like this

1.xlite soft phone working well with same pbx in same network.
2.Grandstream phone taken to office and installed on another matrix IPPBX with different netwoek its workin fine .

do any one has idea what happening it customer network modyfying sip packets.

grandtream grp2601p firmware

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