I needed to configure a SIP trunk with Asterisk to a provider using a Huawei soft switch.<\/p>\n
It was not painless….<\/p>\n
Firstly there was a well known error regarding silence suppression:<\/p>\n
In the SIP INVITE asterisk sends: “a=silenceSupp:off – – – – –<\/span>”<\/p>\n It is too difficult for Huawei’s coders to accomodate this, so it sends back:<\/p>\n “Got SIP response 500 “Server Internal Error” back from XXX.XXX.XXX.XXX<\/span>”<\/p>\n So the way this can be circumvented is by doing this:<\/p>\n So my example use asterisk 10.2.0<\/p>\n Go look at your asterisk source file in chan_sip.c around line 11814<\/p>\n <\/p>\n Comment out this section: Another error appeared<\/strong> that the Huawei soft switch is quite pedantic with session expiry.<\/p>\n Outgoing calls from asterisk to Huawei will work, but incoming calls will be dropped when answered. This is fixed by adding : <\/span>“session-timers=refuse<\/span>” in my sip.conf<\/p>\n sip.conf file that works for me:<\/p>\n Time will tel how stable this config is, but it looks promising. <\/p>\n","protected":false},"excerpt":{"rendered":" I needed to configure a SIP trunk with Asterisk to a provider using a Huawei soft switch. It was not painless…. Firstly there was a well known error regarding silence suppression: In the SIP INVITE asterisk sends: “a=silenceSupp:off – – – – –” It is too difficult for Huawei’s coders to accomodate this, so it … Continue reading Asterisk integration with Huawei Soft-Switch<\/span> \n
\n<\/code><\/p>\n\/* ast_build_string(&a_audio_next, &a_audio_left, "a=silenceSupp:off - - - - -\\r\\n"); *\/<\/pre>\n
<\/code>
\nRecompile and install.
\nNow that has fixed the problem with the silence suppression.<\/p>\n
\nthis is due to this sip communication:<\/p>\n<\/code><\/p>\n[myprovider]\r\ntype=peer\r\nhost=XX.XX.6.5\r\ndisallow=all\r\nallow=g729\r\nallow=alaw\r\ninsecure=port,invite\r\nqualify=yes\r\nnat=no<\/span>\r\ncontext=from-myprovider\r\ncanreinvite=no\r\nt38pt_udptl = yes\r\nsession-timers=refuse<\/pre>\n
<\/code><\/p>\n
\nHope this helps somebody out there.<\/p>\n