How to connect to Huawei devices

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Huawei develops various devices which has nasty bugs in SIP implementation.

Huawei sends pagtches to Asterisk to cripple Asterisk to support their non-standard SIP implementation but do not fix their own implementations.

One we encountered is that in SIP INVITE message Asterisk sends line:

a=silenceSupp:off - - - - -

Huawei softswitch does not like it and returns error.

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Try MOR/M4 Softswitches