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</script>This chapter presents concepts you will need to keep in mind as you deploy voice service on your network. The emphasis is on the SIP (session initiation protocol), as it is the dominant protocol at the time of writing. We describe how it works, and present some cases in which you may encounter difficulties, suggesting how to avoid them.
| citations This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically). | 1 | |
| popularity This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network. | Average | |
| influence This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically). | Average | |
| impulse This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network. | Average | 
