Changes between Version 1 and Version 2 of IPAddressChange-2.7


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Timestamp:
Sep 30, 2019 7:22:51 AM (6 months ago)
Author:
riza
Comment:

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  • IPAddressChange-2.7

    v1 v2  
    4444Related to maintaining a call during IP change, there are some scenarios that are currently not implemented by IP change mechanism, so application needs to handle manually: 
    4545If IP change occurs during SDP negotiation (and it is not completed yet, so there cannot be another SDP offer), updating such call needs to be done in two steps: 
    46 First, updating Contact header, so remote endpoint can send its SDP answer to our new contact address, i.e: use UPDATE without SDP offer ({{{PJSUA_CALL_NO_SDP_OFFER}}} flag).  
     461. Update Contact header, so remote endpoint can send its SDP answer to our new contact address, i.e: use UPDATE without SDP offer ({{{PJSUA_CALL_NO_SDP_OFFER}}} flag). Note that, not every endpoint supports UPDATE. Contact is used by remote to  
     47   resolve target before sending new requests. If proxy is used, then you can probably skip this. 
     482. Update local media transport after SDP answer is received, by sending UPDATE/re-INVITE with {{{PJSUA_CALL_REINIT_MEDIA}}} flag. 
    4749 
    48 Note that, not every endpoint supports UPDATE. Contact is used by remote to resolve target before sending new requests. If proxy is used, then you can probably skip this. 
    49 Update local media transport after SDP answer is received, by sending UPDATE/re-INVITE with {{{PJSUA_CALL_REINIT_MEDIA}}} flag. 
    5050If IP change occurs before a call is established, there are two possible cases: 
    5151Dialog is not yet created, since response with To tag is not received yet. The call needs to be cleared and reported to application via {{{on_call_state().}}} 
    5252Dialog is created, (1xx response with To tag is received). 
    5353 - SDP nego is done, then update Contact and SDP is needed using re-INVITE or UPDATE. 
    54  - SDP nego is not done, see point 2 above. 
     54 - SDP nego is not done, see the steps above. 
     55 
    5556 
    5657