obelousov at gmail.com
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 Posted: Wed Dec 02, 2020 8:54 am Post subject: [Freeswitch-users] Change SDP by SIP UPDATE |
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Hi.Is there a possibility in Freeswitch to update the SDP of a pre-answered call by SIP UPDATE message?
Call flow is as following:
1. FS responds to A-party with 183/SDP (SDP IP==FS IP) and performs some checks in preanswer mode
2. If checks on step 1 passed ok, FS initiates a call to B-party, receives from B-party 183/SDP (SDP IP = MGW_B) and sends to A-party 183/SDP with same new SDP IP = MGW_B, so doing change of SDP parameter in the same transaction.
That scenario executes with below commands (need in media travel directly between parties after the bridge)
session:execute("set","bypass_media=true")
second_session = session:execute("bridge",BridgeStr);
The question: is there a parameter which allows during the bridge to update SDP by SIP UPDATE, instead of changing SDP using provisional responses? A-party switch does not accept such SDP change and thus there is a problem with audio after the bridge.--
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