[asterisk-bugs] [JIRA] (ASTERISK-26005) res_pjsip: Multiple SIP messages are combined into 1 TCP packet

[Rusty Newton (JIRA)]

     [ https://issues.asterisk.org/jira/browse/ASTERISK-26005?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Rusty Newton updated ASTERISK-26005:
------------------------------------

    Status: Open  (was: Triage)

> res_pjsip: Multiple SIP messages are combined into 1 TCP packet
> ---------------------------------------------------------------
>
>                 Key: ASTERISK-26005
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-26005
>             Project: Asterisk
>          Issue Type: Bug
>      Security Level: None
>          Components: Channels/chan_pjsip
>    Affects Versions: 13.8.2, 13.9.0
>         Environment: CentOS 7
>            Reporter: Ross Beer
>
> When using chan_pjsip with TCP transport multiple packets are concatenated into one TCP packet causing the packet to exceed the MTU size.
> Setting the standard kernel options has no effect:
> net.ipv4.ip_no_pmtu_disc = 1
> net.ipv4.tcp_low_latency = 1
> net.ipv4.tcp_autocorking = 0
> The above options should stop the kernel concatenating the packets, however this is still occurring.
> This causes an issue for a lot of handsets, this is most noticeable on handsets that have multiple BLF keys. For example Snom D715 or Cisco SAP504G + Sidecarts. This causes the phones to misbehave and to be come unusable. Switching to UDP or TLS resolves the issue and the phones function correctly. 



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