PJSIP and ChanSIP extensions

General Help
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I would like to know what are the differences between PJSIP and CHANSIP extensions

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chan_sip is old…when you set up a new system use pjsip!

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why choose pjsip which is a recent version instead of chansip. What more does it bring than chansip ?

4

The chan_pjsip module provides additional functionality (for example easier handling of ITSPs that have multiple IPs, as well as multiple registrations per endpoint) and is maintained.

The chan_sip module is no longer maintained and will be removed in the future.

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Here’s some videos I’ve done at Astricon talking about it, though they are more from the focus of Asterisk they can still be useful:

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what does ITSP mean ?

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Internet telephony service provider. Also known as a SIP provider. Providing of SIP trunking.

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There are technical answers supporting this change, but the non-technical one is that chan_sip is deprecated and will be removed in the next version of Asterisk. Any work you do now using chan_sip will need to be redone in the near future.

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Fixed it for you as the next version is v20 which will be LTS.

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tldr: PJSIP allows you to register multiple endpoints against a single extension. which is good.
Desk phone, softphone, mobile softphone? Single extension. no more FindMeFollowMe loops!

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When your WAN goes down, all your LAN SIP extensions will die.
When your WAN goes down, all your LAN PJSIP extensions will keep working.

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12

This is highly situational and dependent on your environment.

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